Question

9. Find the perimeter of each of the following figures : (i) An equilateral triangle of side 13 cm. (ii) A triangle of side 13 cm, 12 cm and 5 cm. (iii) An isosceles triangle with equal sides of 11 cm each and third side 8 cm.​

Answer 1

perimeter -

1. 39 cm

2. 30 cm

3.30 cm

Answer 2

$1) \: \: Perimeter \\ = sum \: of \: all \: length \: of \: Triangle$

$Perimeter = 13 \times 3 \\ = 39 \: cm$

$2) \: Perimeter \: of \: an \: Isosceles \\ triangle \\ = 11 + 11 + 8 \\ = 22 + 8 \\ = 30 \: cm$