Question

what is the perimeter of each of the following figures ? what do you infer from these answers ?

triangle- 10 m,10 m,20 m
square- 10 m,10 m,10 m,10m
rectangle- lenght- 1.25 m breadth- 7.5 m

Answer 1

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(a) Perimeter of square = 4 x side

= 4 x 25 = 100 cm

(b) Perimeter of rectangle = 2 x (length + breadth)

= 2 x (40 + 10)

= 2 x 50 = 100 cm

(c) Perimeter of rectangle = 2 x (length + breadth)

= 2 x (30 + 20)

= 2 x 50 = 100 cm

(d)Perimeter of triangle = Sum of all sides

= 30 cm + 30 cm + 40 cm = 100 cm

• Thus, all the figures have same perimeter.

Answer 2

(a) Perimeter of square = 4 x side

• = 4 x 25 = 100 cm

(b) Perimeter of rectangle = 2 x (length + breadth)

• = 2 x (40 + 10)

• = 2 x 50 = 100 cm

(c) Perimeter of rectangle = 2 x (length + breadth)

• = 2 x (30 + 20)

• = 2 x 50 = 100 cm

(d)Perimeter of triangle = Sum of all sides

• = 30 cm + 30 cm + 40 cm = 100 cm

Thus, all the figures have same perimeter.