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t=3V÷(πr²)
t=3. 1256 ÷ (3,14 . 10²)
t=3768÷314
t=12 cm
s=√(t²+r²)=√(12²+10²)=√(144+100)=√244=15,62 cm
Luas sisi kerucut
=πr(r+s)
=3,14.10(10+15,62)
=31,4(25,62)
=804,468 cm²