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L trapesium = (jumlah luas sejajar)×t/2 =(28+10)×12/2 = 38×12÷2 = 228 cm2
Ltotal = 328cm2 (d)
34. L trapesium =(jumlah luas sejajar)×t/2 =(75+45)×40/2= 2400 cm2
L persegi panjang = p×l = 20×25 = 500cm2
L yg diarsir = 2400-500 = 1900cm2 (b)
35. L trapesium =(jumlah luas sejajar)×t/2 =(94+54)×30/2 = 2220 cm2
L persegi panjang = p×l = 24×20 = 480cm2
L taman = 2220-480 = 1740cm2 (b)