Question

Find the perimeter of the following shapes:
(i) a triangle whose sides are 5.4 cm, 4.6 cm and 6.8 cm
(ii) a regular hexagon of side 8 cm
(iii) an isosceles triangle with equal sides 6 cm each and third side 4.5 cm.

Answer 1

(i) Sides of the triangle are 5.4 cm, 4.6 cm and 6.8 cm.
Perimeter of the triangle = (First side + Second side + Third Side)
= (5.4 + 4.6 + 6.8) cm = 16.8 cm

(ii) Length of each side of the given hexagon = 8 cm
∴ Perimeter of the hexagon = (6 × 8) cm = 48 cm

(iii) Length of the two equal sides = 6 cm
Length of the third side = 4.5 cm
∴ Perimeter of the triangle = {(2 × equal sides) + third side} cm = (2 × 6) + 4.5 = 16.5 cm