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= 9 cm
r = jari jari
s = garis pelukis
t = tinggi kerucut
r^2 = s^2 - t^2
r^2 = 15^2 - 9^2
r^2 = 225 - 81
r^2 = 144
r = 12 cm
keliling lingkaran (alas kerucut )
= 2phi.r
= 2.12.phi ( b)
= 24phi