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rumus sisi kerucut : πr ( r + s)
Lp=2Πr(r+t)
L.selimut=2Πrt
L.alas=Πr²
V=Πr²t
kerucut:
L.permukaan=Πr(r+s)
L.selimut=Πrs
L.alas=Πr²
V=⅓Πr²t