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T = 21 cm ^ 2
Dit : Lp kerucut ... ?
Peny :s^2 = r^2 + t^2
s^2=32^2 + 21^2
s^2= 1024 + 441
s^2= 1465
s=akar^2 dari
1465
s= 38,27 cm
Lp = phi•r(r+s)
=3,14•32(32+38,27)
=3,14•32(70,27)
=3,14•2248,64
=7060,72 cm^2