Find the perimeter of each of the following shapes:
(a) A triangle of sides 3 cm, 4 cm and 5 cm.

(b) An equilateral triangle of side 9 cm.

(c) An isosceles triangle with equal sides 8 cm and third side 6 cm.

Question

Philoid · Accepted Answer

(a) We know that,

Perimeter of a triangle = Sum of all sides

= (3 + 4 + 5) cm

= 12 cm

(b) We know that,

Perimeter of an equilateral triangle = 3 × Side of triangle

= (3 × 9) cm

= 27 cm

(c) We need to find out perimeter of an isosceles triangle:

Perimeter = (2 × 8) + 6

= 22 cm

Find the perimeter of each of the following shapes:(a) A triangle of sides 3 cm, 4 cm and 5 cm.(b) An equilateral triangle of side 9 cm.(c) An isosceles triangle with equal sides 8 cm and third side 6 cm.