Question

the base of an isosceles triangle is 18cm and its area is 108cm² find its perimeter​

Answer 1

here is your answer mark me as

Answer 2

Answer: 42 cm

Step-by-step explanation:

from the question, we know that base = 18 cm and area = 108 cm^2

let the height be x cm

area of a triangle = 1/2 × b × h

Substitute b = 18 and area = 108  

1/2 ×18 × x = 108

9x=108

x=108/9

in an isosceles triangle, the two sides apart from base are equal, so therefore :  

perimeter = 18 + 12 + 12 = 42 cm