1. Perimeter of Plane Figures
Presented by:-
Pooja Srivastava
J.H.S Shamli

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. The perimeter of a circle or ellipse is called itscircumference.

3. Perimeter of Triangle
The equation for the perimeter of any triangle is:
P=a+b+c
Where :
a,b,c are the lengths of the three sides
P is the perimeter.

4. Find the perimeter of a triangle that has sides equal to 3 cm,4cm,3cm
Example-
Find the perimeter of a triangle that has sides equal to 3 cm,4cm,3cm
Solve-
a=3
b=4
c=3
P=a+b+c
P=3+4+3
P=10 cm
The perimeter of a triangle is 10 cm. 3 3 4

5. Perimeter of a Quadrilateral
Quadrilateral is a technical term for any 4-sided figure,including,squares,rectangles,parallelograms,and trapezoids.
Rectangle
Parallelogram
Trapezoid
Square

6. Perimeter of rectangle
The equation for the perimeter of any rectangle is:
P=a+b+c+d
Where :
a,b,c,d are the lengths of the four sides
P is the perimeter l w

7. The perimeter of a rectangle is 40 cm.
Example-
Find the perimeter of a rectangle whose length is 8 cm,and width is 12 cm
Solve-
L=8;
W=12
P=2(l+w);
P=2(8+12)
P=40
P=2*20
The perimeter of a rectangle is 40 cm. 8 12

8. Perimeter of parallelogram
The equation for the perimeter of any parallelogram is:
P=a+b+c+d
Where :
a,b,c,d are the lengths of the four sides
P is the perimeter a b

9. The perimeter of a parallelogram is 80 cm.
Example-
Find the perimeter of a parallelogram whose parallel sides are 16 cm,and 24 cm
Solve-
a=16;
b=24
P=2(a+b);
P=2(16+24)
P=2*40
P=80
The perimeter of a parallelogram is 80 cm. 24 16

10. The equation for the perimeter of any square is: P=4s Where :
Perimeter of square
The equation for the perimeter of any square is:
P=4s
Where :
s is the lengths of the sides
P is the perimeter s

11. Find the perimeter of a square whose sides are 6 cm each. Solve- s=6
Example-
Find the perimeter of a square whose sides are 6 cm each.
Solve-
s=6
P=4s
P=4*6
P=24
The perimeter of a square is 24 cm. 6

12. Perimeter of trapezoid
The equation for the perimeter of any trapezoid is:
P=a+b+c+d
Where :
a,b,c,d are the lengths of the four sides
P is the perimeter d c b

13. Find the perimeter of a trapezoid whose sides are 7 cm,6 cm,16cm,11cm
Example-
Find the perimeter of a trapezoid whose sides are 7 cm,6 cm,16cm,11cm
Solve-
a=7
b=6
c=16
d=11
P=a+b+c+d P=
P=40
The perimeter of a trapezoid is 40 cm. 7 16 11 6

14. Circumference of a circle
The equation for the circumference of any circle is:
C=2∏r Or
C=∏d
Where:
∏=approximately 3.14 or 22/7
r is the radius of the circle
d is the diameter of the circle
C is the circumference d

15. What is the circumference of the circle that has a radius of 15 cm.
Solve:
r=15
C=2∏r
C=2*3.14*15
C=94.2
The circumference of a circle is 94.2 cm 15

16. Thanks