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K=2×phi×r
K 1/4=1/4(2×phi×r)
=1/4(2×3,14×10)
=1/4 . 62,8
=15,7 cm
B.
K1=2×(p+l)
=2×(25+14)
=2×39
=78cm
K2=phi×diameter
K 1/2=1/2 (22/7×14)
=1/2×44
=22cm
Keliling=78cm+22cm=100cm
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