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2014-06-02T15:20:43+07:00
22/7 . d = 88
         d = 88 . 7/22
         d = 28
         r = 14 cm
Luas = 22/7 . 14 .14
        = 616 cm2
1 5 1
2014-06-02T15:24:35+07:00
Kll = 2πr
88= 2x 22/7x r
r = 14cm
L = πr^2 (r kuadrat)
= 22/7 x (14)^2
= 616 cm^2