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s ² =tinggi ²+jarijari ²
s ² =12²+5²
s ² = 144+25
s ² = 169
s=13 cm
luas selimut
=phi x r x s
=3,14 x 5 x 13
=204,1 cm ²
2.
luas bola max
=4 x phi x r x r
=4 x 22/7 x a x a
=88/7 x a² cm ²