Question

I need help on a question

Answer 1

Given a triangle with base b and perpendicular height h, then

`\text{ the area of the triangle = }(1)/(2)* bh`

b = m, h = n,

`\text{ the area of the triangle = }(1)/(2)mn`

Given a rectangle with length l and width w, then

`\text{ the area of the rectangle = }l* w`

In this case,

l = n and w = m

Therefore,

`\text{ the area of the rectangle = }mn`

Therefore,

the area of the triangle TRI is half the area of the rectangle RECT