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15 : x
x =
yg ditanya Kell alas kerucut
bentuk alaas kerucut adalah lingkaran
maka kell lingkaran ada;ah
jadi
15²=r²+9²
225=r²+81
144=r²
12 cm = r
keliling alas= 2 x 12 x 3,14 = 75,36 cm