Question

The base of an isosceles right triangle is 30 cm. Its area is 

A. 225 cm² 

B.225\(\sqrt[]{3}\)cm² 

C.225\(\sqrt[]{2}\) cm² 

D. 450 cm²

Answer 1

Base = 30 cm, 

Altitude = 30 cm

Area of ∆ =\(\frac{1}2\)(Base x Altitude)

Area of ∆ =\(\frac{1}2\) (30 x 30)

= 450 cm²

Answer 2

Since it is an isosceles rgt triangle and with base =30cm

Therefore, its perpendicular also= 30cm

Now, area = 1/2 ×base × perpendicular = 1/2×30× 30= 450 cm^2