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=120/360 2πR
=2/3 . 3,14. 30
=62,8 cm
Jari-jari kerucut
= K ÷ 2π
= 62,8 ÷ 2 . 3,14
= 62,8 ÷ 6,28
= 10 cm
Garis pelukis = Jari jari lingkaran = 30 cm
Tinggi kerucut
t²=s²-r²
t²=30²-10²
t²=900 - 100
t²=800
t=√800
t=√400√2
t=20√2 cm
atau
t=28,28 cm