Respuesta :

Multiple rules you have to know. Starting from the top angle.

Angle a) - Angles opposite each other equal each other

Angle b) - sum of angles in a triangle should equal 180. The right angle is 90 and you already know angle a)

Angle c) - the flat angle on a line should be equal to 180. So part of it is 65 rest is the rest of 180


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