Triangleis isosceles sinceis isosceles similarly.

We can labels the angles as below.

Thenandas below.

Then the remaining angles as below (sinceis a straight line, soand similarly for BOC)

Then

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Triangleis isosceles sinceis isosceles similarly.

We can labels the angles as below.

Thenandas below.

Then the remaining angles as below (sinceis a straight line, soand similarly for BOC)

Then