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rumus setengah lingkaran = 3.phi.r.r.r
= 3 . phi . r . r . r
= 3 . 22/7 . 7 . 7 . 7
= 3. 22 .7 .7
= 66 . 49
= 3234
= akar 3234 = 56,868
jari-jari lingkaran kerucut berbentuk lingkaran,
jadi menggunkan rumus luas lingkaran
L.Lingkaran = phi . r . r
= 22/7 . 7 . 7
= 22. 7
= 154
akar dari 154 = 12,8
semoga bs membantu