1 Answer

Zamel · Answer 1 · 2021-11-29T23:01:19+0000

Answer:

$A=128\ cm^2$

Explanation:

we know that

The area of the polygon is equal to the area of a square plus the area of four congruent triangles

so

A=b^2+4[(1)/(2)(b)(h)]

where

$b=8\ cm\\h=4\ cm$

substitute

A=8^2+4[(1)/(2)(8)(4)]

$A=64+64=128\ cm^2$

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