Question

How to do this ?? help

Answer 1

45 cm²

Explanation:

The area of the shaded region is calculated as

area of outer triangle - area of inner triangle

area of outer =
`(1)/(2)` bh ( b is the base and h the height ) , then

A =
`(1)/(2)` × 15 × 10 = 75 cm²

area of inner =
`(1)/(2)` × 12 × 5 = 30 cm²

Thus

area of shaded region = 75 - 30 = 45 cm²