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phi.r.r.t
22/7 . 21 cm . 21 cm . 50 cm
= 69,300 cm
V.1/2 lingkaran =
1/2.phi.r.r
1/2 .22/7. 21 cm .21 cm
==> 1/2.1386 cm
===> 693 cm
v.gabungan
= 69,300 cm + 693 cm
= 69,993 cm