For Finding Perimeter and Circumference (Images not mine)

1. Math Presentation
By:
Armarie and Marga

2. Perimeter
A perimeter is a path that surrounds a two-
dimensional shape. The word comes from the
Greek peri (around) and meter (measure). The
term may be used either for the path or its
length - it can be thought of as the length of
the outline of a shape.

3. Perimeter of A triangle
P= a+b+c
Example:
Given: a=12cm
b= 18 cm
c= 20 cm
P= a+b+c
P= 12 cm+18 cm+20cm
P= 50 cm

4. Peimeter of A Square
P= 4s
Example:
Given: a= 25 cm
P=4s
P=4(25 cm)
P= 100 cm

5. Perimeter of A Rectangle
P= 2(l+w)
Example:
Given: w= 3 cm
l= 7 cm
P= 2(l+w)
P= 2(3 cm+7 cm)
P= 2 (10 cm)
P= 20 cm

6. Perimeter of a Parallelogram
P= 2(a+b)
Examples:
Given: a= 17 m
b= 18 m
P= 2(a+b)
P= 2(17 m+18 m)
P= 2(35 m)
P= 70 m

7. Perimeter of A Trapezoid
P= a+b1+b2+c+h
Example:
Given: a= 12 mm
b1= 2 mm
b2= 14 mm
c= 13 mm
h= 11 mm
P= a+b1+b2+c+h
P= 12 mm+ 2 mm+ 14 mm+ 13 mm+
11 mm
P= 52 mm

8. Perimeter of A Rhombus
P= 4s
Example:
Given: s= 8 cm
P= 4s
P= 4(8 cm)
P= 32 cm

9. Circumference
C= πd or 2πr
Example:
Given: r= 49 mm
C= 2πr
C= 2(3.14)(49 mm)
C= 2(153.86mm)
C= 307.72 mm

10. Exercises
Find the Perimeter:

11. Exercises
FIND THE PERIMETER:

12. Exercises
FIND THE PERIMETER:

13. Exercises
FIND THE PERIMETER:

14. Exercises