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132=2×22/7×r
132=44/7×r
132×7=44×r
924/44=r
r=7
luasnya adalah 22/7×7×7=22×7=154cm ^2
k= phi X d
132cm= phi X d
132cm= 22/7 X d
d= 132/22 X 7
d= 6 X 7
d= 42 cm
r= 42/2= 21 cm
dit L ?
jawab L= phi r kuadrat
L= 22/7 X 21 X 21
L= 1386
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