This document discusses formulas and methods for finding the areas and perimeters of parallelograms, triangles, trapezoids, rhombuses, and kites. It provides examples of using these formulas to calculate side lengths, heights, areas, and perimeters when given certain measurements of the shapes. It also includes practice problems for students to solve.
The Secret Annex and the People Hiding In Itguest2c83a5
I had to do a powerpoint for school about the secret annex and the people that hid in it. Do you think this is good? I need it to be because it's worth an exam grade. Please give me your feedback and tell me anything I should add or fix.. thanks :]
The Secret Annex and the People Hiding In Itguest2c83a5
I had to do a powerpoint for school about the secret annex and the people that hid in it. Do you think this is good? I need it to be because it's worth an exam grade. Please give me your feedback and tell me anything I should add or fix.. thanks :]
By this end of the presentation you will be able to:
Identify and model points, lines, and planes.
Identify collinear and coplanar points.
Identify non collinear and non coplanar points.
International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and students around the globe to publish high quality, peer-reviewed articles on all theoretical and empirical aspects of Engineering and Science.
The peer-reviewed International Journal of Engineering Inventions (IJEI) is started with a mission to encourage contribution to research in Science and Technology. Encourage and motivate researchers in challenging areas of Sciences and Technology.
By this end of the presentation you will be able to:
Identify and model points, lines, and planes.
Identify collinear and coplanar points.
Identify non collinear and non coplanar points.
International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and students around the globe to publish high quality, peer-reviewed articles on all theoretical and empirical aspects of Engineering and Science.
The peer-reviewed International Journal of Engineering Inventions (IJEI) is started with a mission to encourage contribution to research in Science and Technology. Encourage and motivate researchers in challenging areas of Sciences and Technology.
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International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
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1. UNITS 1.1/1.2 AREA OFUNITS 1.1/1.2 AREA OF
PARALLELOGRAMS, TRIANGLES,PARALLELOGRAMS, TRIANGLES,
TRAPEZOIDS, RHOMBUSES, ANDTRAPEZOIDS, RHOMBUSES, AND
KITESKITES
2. Warm Up
Find the unknown side length in each
right triangle with legs a and b and
hypotenuse c.
1. a = 20, b = 21
2. b = 21, c = 35
3. a = 20, c = 52
c = 29
a = 28
b = 48
3. Develop and apply the formulas for the
areas of triangles and special
quadrilaterals.
Solve problems involving perimeters
and areas of triangles and special
quadrilaterals.
Objectives
4. A tangram is an ancient Chinese puzzle made
from a square. The pieces can be rearranged to
form many different shapes. The area of a figure
made with all the pieces is the sum of the areas of
the pieces.
5. Recall that a rectangle with base b and height h has
an area of A = bh.
You can use the Area Addition Postulate to see that
a parallelogram has the same area as a rectangle
with the same base and height.
6. Remember that rectangles and squares are also
parallelograms. The area of a square with side s is
A = s2
, and the perimeter is P = 4s.
7. The height of a parallelogram is measured
along a segment perpendicular to a line
containing the base.
Remember!
8. The perimeter of a rectangle with base b
and height h is P = 2b + 2h or
P = 2 (b + h).
Remember!
9. Find the area of the parallelogram.
Example 1A: Finding Measurements of Parallelograms
Step 1 Use the Pythagorean Theorem to
find the height h.
Step 2 Use h to find the area of the parallelogram.
Simplify.
Substitute 11 for b and 16 for h.
Area of a parallelogram
302
+ h2
= 342
h = 16
A = bh
A = 11(16)
A = 176 mm2
10. Example 1B: Finding Measurements of Parallelograms
Find the height of a rectangle in which b = 3 in.
and A = (6x² + 24x – 6) in2
.
Sym. Prop. of =
Divide both sides by 3.
Factor 3 out of the expression
for A.
Substitute 6x2
+ 24x – 6
for A and 3 for b.
Area of a rectangleA = bh
6x2
+ 24x – 6 = 3h
3(2x2
+ 8x – 2) = 3h
2x2
+ 8x – 2 = h
h = (2x2
+ 8x – 2) in.
11. Example 1C: Finding Measurements of Parallelograms
Find the perimeter of the rectangle, in which
A = (79.8x2
– 42) cm2
Step 1 Use the area and the height to
find the base.
Substitute 79.8x2
– 42 for
A and 21 for h.
Divide both sides by 21.
Area of a rectangleA = bh
79.8x2
– 42 = b(21)
3.8x2
– 2 = b
12. Example 1C Continued
Step 2 Use the base and the height to find the
perimeter.
Simplify.
Perimeter of a rectangle
Substitute 3.8x2
– 2 for b
and 21 for h.
P = 2b + 2h
P = 2(3.8x2
– 2) + 2(21)
P = (7.6x2
+ 38) cm
13. Check It Out! Example 1
A = bh
Find the base of the parallelogram in which
h = 56 yd and A = 28 yd2
.
28 = b(56)
56 56
b = 0.5 yd
Area of a parallelogram
Substitute.
Simplify.
14.
15. Find the area of a trapezoid in which b1 = 8 in.,
b2 = 5 in., and h = 6.2 in.
Example 2A: Finding Measurements of Triangles and
Trapezoids
Simplify.
Area of a trapezoid
Substitute 8 for b1, 5 for b2,
and 6.2 for h.
A = 40.3 in2
16. Example 2B: Finding Measurements of Triangles and
Trapezoids
Find the base of the triangle, in which
A = (15x2
) cm2
.
Sym. Prop. of =
Divide both sides by x.
Substitute 15x2
for A and
5x for h.
Area of a triangle
6x = b
b = 6x cm
Multiply both sides by
17. Example 2C: Finding Measurements of Triangles and
Trapezoids
Find b2 of the trapezoid,
in which A = 231 mm2
.
2
11
Multiply both sides by .
Sym. Prop. of =
Subtract 23 from both sides.
b1
Substitute 231 for A, 23 for ,
and 11 for h.
Area of a trapezoid
42 = 23 + b2
19 = b2
b2 = 19 mm
18. Check It Out! Example 2
Find the area of the triangle.
Find b.
A = 96 m2
Substitute 16 for b and
12 for h.
Area of a triangle
Simplify.
19. The diagonals of a rhombus or kite are
perpendicular, and the diagonals of a
rhombus bisect each other.
Remember!
20.
21. Example 3A: Finding Measurements of Rhombuses
and Kites
Find d2 of a kite in which d1 = 14 in. and
A = 238 in2
.
Area of a kite
Substitute 238 for A and 14 for d1.
Solve for d2.
Sym. Prop. of =
34 = d2
d2 = 34
22. Example 3B: Finding Measurements of Rhombuses
and Kites
Find the area of a rhombus.
.
Substitute (8x+7) for d1
and (14x-6) for d2.
Multiply the binomials
(FOIL).
Distrib. Prop.
Area of a rhombus
23. Example 3C: Finding Measurements of Rhombuses
and Kites
Find the area of the kite
Step 1 The diagonals d1 and
d2 form four right triangles.
Use the Pythagorean Theorem
to find x and y.
282
+ y2
= 352
y2
= 441
y = 21
212
+ x2
= 292
x2
= 400
x = 20
24. Step 2 Use d1 and d2 to find the area.
d1 is equal to x + 28, which is 48.
Half of d2 is equal to 21, so d2 is equal to 42.
A = 1008 in2
Area of kite
Substitute 48 for d1
and 42 for d2.
Simplify.
Example 3C Continued
25. Check It Out! Example 3
Find d2 of a rhombus in which d1 = 3x m
and A = 12xy m2
.
d2 = 8y m
Formula for area of a rhombus
Substitute.
Simplify.
26. Example 4: Games Application
The tile design shown is a rectangle with a
base of 4 in. and a height of 2 in. Use the grid
to find the perimeter and area of the leftmost
shaded parallelogram.
Perimeter:
Two sides of the parallelogram
are vertical and the other two
sides are diagonals of a square
of the grid. Each grid square has a side length of 1 in.,
so the diagonal is The perimeter of the leftmost
shaded parallelogram is P = 2(1)+2( ) = (2 +
2 ) in.
27. Example 4 Continued
The tile design shown is a rectangle with a
base of 4 in. and a height of 2 in. Use the grid
to find the perimeter and area of the leftmost
shaded parallelogram.
Area:
The base and height of the
leftmost shaded parallelogram
each measure 1 in., so the area
is A = bh = (1)(1) = 1 in2
.
28. Check It Out! Example 4
In the tangram, find the perimeter and area of
the large green triangle. Each grid square has
a side length of 1 cm.
The area is A = 4cm2
.
The perimeter is
P = (4 + 4 ) cm.
29. Lesson Quiz: Part I
Find each measurement.
1. the height of the parallelogram, in which
A = 182x2
mm2
h = 9.1x mm
2. the perimeter of a rectangle in which h = 8 in.
and A = 28x in2
P = (16 + 7x) in.
30. Lesson Quiz: Part II
3. the area of the trapezoid
A = 16.8x ft2
4. the base of a triangle in which
h = 8 cm and A = (12x + 8) cm2
b = (3x + 2) cm
5. the area of the rhombus
A = 1080 m2
31. Lesson Quiz: Part III
6. The wallpaper pattern shown is a rectangle with a
base of 4 in. and a height of 3 in. Use the grid to
find the area of the shaded kite.
A = 3 in2
32.
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