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Verified answer
Luas 1/2 lingkaranLa = 1/2πr" = 1/2 . 3,14 . 10" = 1/2 . 3,14 . 100 = 157 dm"
luas layang2
Lb = 1/2 . d1 . d2 = 1/2 . 21 . 16 = 168 dm"
Ltot = La + Lb = 157 + 168 = 325 dm"
folow kaka ya....:)