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k.o =78,50 cm
k.o = n x d
78,50 = 3,14 x d
d = 78,50/3,14
d = 25 cm
no 5
keliling yg tdk di arsir berbentuk lingkaran :
d = 14 cm
k.o = n d
k.o = 22/7 x 14
k.o = 44 cm
maka keliling yg di arsir :
= 2p + k.lingkaran
=2.20 + 44
=40 + 44
=84 cm
K lingkaran = pi.d
78,5 = 3,14.d
25 = d (b)