The base of an isosceles triangle measures 80 cm and its area is 360 `cm^2`. Find the perimeter of the triangle.

Answer

162 cm

Explanation

`(1)/(2) xx 80 cm xx h = 360 cm^(2) rArr h = (360)/(40)cm = 9 cm`.
`AB^(2) = (40 cm)^(2) + h^(2) = (40 cm)^(2)+(9 cm)^(2) = 1681 cm^(2)`
`rArr" "AB = sqrt(1681) cm = 41 cm`.
`therefore" "AC = AB = 41 cm`.