bLuas segi banyak= Luas belah ketupat + trapesium= (1/2.D1.D2) + (1/2.(a+b).t)= (1/2.18.18) + (1/2.(18+9).9)= 162 + 121,5= 283,5 cm²cLuas segi banyak= Luas jajargenjang + Luas segitiga= (a x t) + (1/2.a.t)= (12 x 10) + (1/2 x 12 x 5)= 120 +30= 150 cm²d.Luas segibanyak= Luas persegi panjang1 - Luas persegi panjang2 - Luas persegi= (18 x 25) - (10 x 13) - (10²)= 450 - 130 - 100= 220 cm²
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b
Luas segi banyak
= Luas belah ketupat + trapesium
= (1/2.D1.D2) + (1/2.(a+b).t)
= (1/2.18.18) + (1/2.(18+9).9)
= 162 + 121,5
= 283,5 cm²
c
Luas segi banyak
= Luas jajargenjang + Luas segitiga
= (a x t) + (1/2.a.t)
= (12 x 10) + (1/2 x 12 x 5)
= 120 +30
= 150 cm²
d.
Luas segibanyak
= Luas persegi panjang1 - Luas persegi panjang2 - Luas persegi
= (18 x 25) - (10 x 13) - (10²)
= 450 - 130 - 100
= 220 cm²