October 2018 2 57 Report
Diketahui O adalah titik pusat lingkaran.
Besar COD 50 derajat, aob 70 derajat luas juring oab 210 cm2. Luas juring OBC adalah .... cm2 (pakai cara)
A. 100
B. 120
C. 150
D. 180

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