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Disitu ada bangun persegi dan segitiga
Rumus dasar luas segitiga = 1/2 x alas x tinggi
LΔ DCF = 1/2 x DC x CF
LΔ DCF = 1/2 x 6 x 1
LΔ DCF = 3 cm2
BF = BC - CF
BF = 6 - 1
BF = 5 cm
LΔ BEF = 1/2 x BE x BF
LΔ BEF = 1/2 x 2 x 5
LΔ BEF = 5 cm2
Luas persegi = 6 x 6 = 36 cm2
Luas arsir = luas persegi - luas segitiga
Luas arsir = 36 - (5 + 3)
Luas arsir = 36 - 8
Luas arsir = 28 cm2
6)
Disitu ada bangun persegi dan trapesium
Luas persegi = 10 x 10 = 100 cm2
panjang alas trapesium = 20 - 10 = 10 cm
tinggi trapesium = 10 - 6 = 4 cm
Luas trapesium = 1/2 x (8 + 10) x 4
Luas trapesium = 2 x 18
Luas trapesium = 36 cm2
Luas bangun = luas persegi + luas trapesium
Luas bangun = 100 + 36
Luas bangun = 136 cm2