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(phi x r x r) + (phi x r x s)
(3.14 x 5 x 5) + ( 3.14 x 5 x 14 )
(78.5 ) + ( 204.1)
=282 .6
nb
s =
akar r2 + t2
akar 5 2 + 12 2
akar 25 + 144
akar 169
=13