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= 1/2 x 90
= 45⁰
b. <OAC = 1/2 (360-(360-<AOB)- <ACB
= 1/2 (<AOB-<ACB)
= 1/2 x (90-45)
= 22,5⁰
c. <OBC = <OAC
= 22,5⁰
besar OAC=180-90-45=45 drajat
besar OBC=45 drajat
Maaf kalau salah
just report it