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r = 1/2 x 18
r = 9 cm
t kerucut = √s²-r²
= √15²-9²
= √225-81
= √144
= 12 cm
t : r
= 12 : 9
= 4 :3
Tinggi = s²- r²
= 15²-9²= 225-81= 144 = 12