1. FORMULAS
PERIMETER, AREA.

2. 10-7 PERIMETER
You can find the PERIMETER (P) of a
Polygon by adding the lengths of its
sides.
P= 2l + 2w
P=s+s+s P = s+s+s+s P=s+s+s+s+s P = Perimeter
or l = length
P = 4s w= width

3. The units to measure the
Perimeter
Km m dm cm mm

4. 10-8 AREA OF SQUARES AND RECTANGLES
The AREA of a figure is the amount of
surface it covers… the Perimeter and all
the surface INSIDE the line of the
Perimeter
The most common units SQUARE to
measure the area :
Km2 m2 cm2

5. 10-8 AREA OF SQUARES AND RECTANGLES
w or h
l or b s
a= bxh
a=bxh a=lxw a = s2
or
b = base l = length a= l x l
h = height w = wide
a=l2

6. 10-10 AREA OF PARALLELOGRAMS AND TRIANGLES
A=bxh

7. REMEMBER…
IN A PARALLELOGRAM
THE LENGTH OF A SIDE THAT IS NOT
PERPENDICULAR TO THE BASE…
DOES NOT REPRESENT THE HEIGHT…
THE HEIGHT MUTS BE PERPENDICULAR TO THE
BASE.

8. 10-10 AREA OF PARALLELOGRAMS AND TRIANGLES
A=bxh

9. 10-10 AREA OF PARALLELOGRAMS AND TRIANGLES
A= bxh
2

10. 10-11 CIRCUMFERENCE
The Length of the line is the
CIRCUMFERENCE (C)
of the circle.
The Formula to find Perimeter
C=πd
(when you know the diameter )
C = 2π r
(when you know the radius)

11. 10-11 CIRCUMFERENCE
C=πd C = 2π r
C = Circumference
π = Greek letter (pi) used to represent the ratio
between the circumference and its
diameter.
The relationship between the length of the
circumference and its
diameter.
The value of “pi” = 3.14 or 22/7
d = diameter

12. 10-11 CIRCUMFERENCE

13. 10-12 CIRCLE
A Circle is a simple closed curve that divides the plane in two regions:
Interior and Exterior.
The AREA of the CIRCLE… is the area of space inside the circle.
Formula A =
πr2