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(2+8)×(3+5)-(8)×(5)
10×8-8×5
80-40=40cm²
A rectangulo-A del triangulo no sombreado
(12)×(6)-(12×3)/2
72-36/2
72-18=54cm²
√3×a²/4=9√3
√3×a²=36√3
a²=36
a=6cm
A del rectangulo - A del rombo
(14)×(6)-(14×6)/2
84-84/2
84-42=42cm²