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32.D.148cm²
33.A.68cm
34.B.72 cm
L.persegi = s*s = 20*20 = 400 cm kuadrat
L.trapesium = jml.sisi.sejajar*t/2
= (10+20)*10/2
= 30*10/2
= 300/2 = 150 cm kuadrat
L.arsir = 400-150 = 250 cm kuadrat (C)
32. L.arsir = L.segitiga1+L.segitiga2
L.segitiga 1 = 1/2*a*t
alas = 8kuadrat + 6 kuadrat
= 64+ 36
= 100
alas = akar dari 100 = 10
= 1/2* 10*7
= 1/2*70=35 cm kuadrat
L.segitiga2 = 1/2*a*t
= 1/2*10*12
= 1/2*120 = 60 cm kuadrat
L.arsir = 35+60 = 95 cm kuadrat
33. -
34. Keliling = 22+(10*5)
= 22+50 = 72 cm (B)
Maaf klau salah, hanya coba membantu, thanks :)