l lingkaran : phi.r.r
: 22/7 . 21 .21
:1386 cm2
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Phi 22/7
R: 21
Jawab:
22/7x 21x21: 1386
L: 1386 Cm
l lingkaran : phi.r.r
: 22/7 . 21 .21
:1386 cm2