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Verified answer
Tinggi trapesium = √25²-7²= √625-49
= √576
= 24cm
Luas trapesium = ½ t (jumlah sisi sejajar)
= ½ 24cm (28cm + 14cm)
= 12cm x 42cm
= 504cm²
Luas ½ Lingkaran = ½πr²
= ½ 22/7 (7cm)²
= 77cm²
Luas arsir = Luas trapesium - Luas ½ lingkaran
= 504cm²-77cm²
= 427cm² (C)