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Luas juring = a/360 x πr²
Lj = 90/360 x 3,14 x 10²
Lj = ¼ x 314
Lj = 78,5
Luas segitiga = ½ x a x t
L∆ = ½ x 10 x 10 = 50
L tembereng = Lj - L∆
Lt = 78,5 - 50 = 28,5 cm²
jawabannya A
16.
Luas juring AOB/ Luas juring BOC = sudut aob/sudut boc
*dikalikan silang yaa*
Luas juring BOC = (Luas juring AOB x sudut boc) / sudut aob
Lj BOC = (32 x 150) / 40
Lj BOC = 4800 / 40 = 120 cm²
jawabannya A.
:)