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L = phi r^2
616 = 22/7 r^2
616x7/22 = r^2
196 = r^2
r = 14
cari selimut
akar 14^ + 48^
=akar 196 + 2304
=akar 2500
=50
Luas selimut
phi x r x s
22/7 x 14 x 50
=2200