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rumus trapesium
L = 1/2 × (sisi sejajar) × tinggi
L = 1/2 × (35+25) × 28
L = 1/2 × 60 × 28
L = 30 × 28
L = 840 cm2
no 6
rumus layang2
L = 1/2 × D1 × D2
L = 1/2 × 25 × 40
L = 25 × 20
L = 500 cm2
no 7
rumus layang2
L = 1/2 × D1 × D2
L = 1/2 × 50 × 60
L = 50 × 30
L = 150p cm2
no 8
L1 = rumus persegi panjang
L = p × l
L = 30 × 18
L = 540 cm2
L 2 = rumus trapesium
L = 1/2 × (sisi sejajar) × tinggi
L = 1/2 × (5 + 25) × 9
L = 1/2 × 30 × 9
L = 15× 9
L = 135 cm2
yg terbuang
L1 - 2(L2) (sebab ada 2 trapesium)
540 - 270
= 270 cm2