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How do you find the measure of this angle ?

How do you find the measure of this angle ?-example-1
User Ohad Navon
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The lines through the sides in the circle indicate that the three sides are all of the same length, and therefore share the same angle.

A shape inside a circle will always have its angles equal 360, so you can find the individual angle with the following equation:


120 + 3x = 360

Subtract 120 from both sides.


3x = 240

Divide both sides by 3.


x = 80

mBC's angle is 80 degrees.
User Kelstar
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