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= ½ x ( 22/7 ) x 7 x 7
= 11 x 7
= 77 cm²
L. trapesium = ½ x ( a + b ) x t
= ½ x ( 14 + 28 ) x 15
= ½ x 42 x 15
= 21 x 15
= 315 cm²
L. arsir = L. trapesium - L. lingkaran
= 315 - 77
= 238 cm² ( B )