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= α/360 x L lingkran
= 108/360 x πr²
= 108/360 x 3,14 x 10²
= 108/360 x 314
= 94,2
juring yg kecil
= α/360 x L ingkaran
= 72/360 x πr²
= 72/360 x 3,14 x 5²
= 72/360 x 78,5
= 15,7
L yg diraster = LJ besar - LJ kecil
= 94,2 - 15,7
= 78,5 ==> B