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= 20 x 8
= 160 cm
L.bangun seperempat lingkaran = π.r^2 (kuadrat)
=3,14 x 10^2 (20 :2 =10 jari-jarinya)
=3,14 x 100
= 314 : 4
=78,5cm
jadi luas bangun tersebut
= 160 + 78,5
= 238,5 cm