Arc sizes AB = BC. Find the value of the arc size BC.
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Given: AB=BC.
AC=82°
To find: The value of the value of arc BC.
Solution:
AC = 82°------------(given)
AB + BC = 360°-82°=278°
Therefore, AB+BC= 2(AB) = 278°
AB = BC = 278°/2----------------(given, AB = BC)
AB = BC = 139°
Answer: BC = 139°
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