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7.Luas=250 cm^2.
Diagonal 1 (BD)=(10 × 2)cm.
=20 cm.
Diagonal 2 (AC)=(Luas × 2) ÷ Diagonal 1 (BD).
=((250 × 2) ÷ 20)cm.
=(500 ÷ 20)cm.
=25 cm.
8.Luas=3.060 m^2.
Jumlah sisi sejajar (a + b)=(100 + 70)m.
=170 m.
Tinggi=(Luas × 2) ÷ Jumlah sisi sejajar (a + b).
=((3.060 × 2) ÷ 170)m.
=(6.120 ÷ 170)m.
=36 m.