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kel=phi.d
66=22/7d
d=66.7 / 22
d=21 ~ r= d÷2=10,5 cm
s=√t²+r²=√30²+10,5²
=√900+110,25
=√1010,25=31,8cm
vol=phi.r(r+s)
=22/7 × 10,5 (10,5 + 31,8)
=33 × 42,3=1395,9 cm³
r = 66 : (2x22/7) = 66 : 44/7
= 66 x 7/44 = 21/2
= 10,5 cm
Volume kerucut = 1/3 x 22/7 x 10,5 x 10,5 x 30 cm^3
= 3465 cm^3