Answer:
d² + df + dg + dh = d(d + f + g + h)
Explanation:
Lower rectangle:
length = f + d + h
width = d
Upper rectangle:
length: d
width: g
total area:
d(f + d + h) + dg =
= df + d² + dh + dg
= d² + df + dg + dh
= d(d + f + g + h)
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