Kak gimana nih Caranya ???
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L 1/2 lingkaran = 1/2 phi r²
= 1/2 x 3,14 x 10² = 157
L trapesium = 1/2 x (a+b) x t
= 1/2 (20+28) x 10
= 1/2 (48) x 10
= 240
L bangun = 157 + 240 = 397 cm²