Finding the Third Angle in a Triangle

Finding the Third Angle of a Triangle

The sum of the interior angles of a triangle are equal to 180^o. To find the third angle of a triangle when the other two angles are known subtract the number of degrees in the other two angles from 180^o.

Example: How many degrees are in the third angle of a triange whose other two angles are 40^o and 65^o? Answer: 180^o - 40^o -65^o = 75^o

Find the numbr of degrees in the third angle of each triangle.

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