Jawabanmu

2014-06-10T20:34:37+07:00
Keliling = 31,4
31,4 = 3,14. d
d = 31,4 รท 3,14
= 10
r = 5

luas = 3,14.5.5
= 78,5 cm2
k=31,4
k=2.phi.r
31,4=2.3,14.r
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