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= 4x10 - 1/4x2x3,14x10
= 40 - 15,7
= 24,3 cm
jadi, keliling bangun yang diarsir adalah 24,3 cm
C.
K.persegi = 4 x s = 4 x 10cm = 40cm
K.lingkaran =
k.arsir = k.persegi - k.lingkaran = 40cm - 15,7cm = 24,3cm
maaf ya, yang B aku kurang ngerti :)