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TRAPESIUM ABCD
EB = 7 cm
DC = 8 cm
AE = 3 cm
DE tegak lurus AB
L segitiga BEC = 14 cm^2
L trapesium ABCD = ...?

L segitiga BEC = 1/2 × EB × CE
14 = 1/2 × 7 × CE
CE = (14 × 2)/7
CE = 28/7
CE = 4 cm

L trapesium ABCD = 1/2 × (DC + EB + AE) × CE
= 1/2 × (8 + 7 + 3) × 4
= 1/2 × 18 × 4
= 36 cm^2 (C)