Lp = 2 phi r (t + √t2 + r2 )
V = vol 2 kerucut + vol tabung
V = 2 x 1/3 phi r2 t + phi r2 t
V = 2/3 phi r2 t + phi r2 t
V = 5/3 phi r2 t
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c). Lp = luas selimut kerucut + luas ½ bola
Lp = phi r s + ½ x 4 phi r2
Lp = phi r s + 2 phi r2
Lp = phi r (s + 2r)