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AB × 80 = 24 × 120
80AB = 2880
AB = 36
Jawaban nomor 11 ~> C. 36 cm.
α = 360 - 252
= 108
L Juring = α/360 × L lingkaran
= 108/360 × π × r²
= 3/10 × 3,14 × 10²
= 3/10 × 314
= 942/10
= 94,2 cm²
Jawaban nomor 12 ~> D. 94,2 cm²