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25. B. 747 cm²
Luas 1/2 lingkaran = 1/2πr²
= 1/2 x 3,14 x 10²
=1/2 x 3,14 x 100
=1/2 x 314
= 157 cm²
Luas persegi panjang=p x l
= 20 x 22
= 440 cm²
Luas segitiga = 1/2 a x t
= 1/2 15 x 20
= 15 x 10
= 150 cm²
Luas gabungan
= 157 + 440 + 150
= 747 cm²