Question

the base of an isosceles right triangle is 30cm.how to find area

Answer 1

Area of a triangle = 1/2 base * altitude = 1/2 30 cm * 30 cm = 450 cm²

Answer 2

Given that,
base of an isosceles right triangle = 30 cm
Area of isosceles right triangle = $\frac{1}{2}a^2$ [where 'a' is equal side]

$\frac{1}{2}(30)^2$

$\frac{1}{2}*(900)$

= 450 sq cm