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User Arbuthnott
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1 Answer

21 votes
21 votes

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

User IgorekPotworek
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