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r=L÷πs=380÷3,14.20=6,05 cm
t²=s²-r²=20²-6,05²=400-36,6025=363,3975
t=√363,3975=19,06
a).
Luas alas
=πr²
=3,14 . 6,05²
=114,93 cm²
b).
Volume kerucut
=⅓πr²t
=⅓.3,14.6,05².19,06
=730,2 cm³