write angle sum property and exterior angle property of triangle
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Angle Sum Poperty = sum of three angles of triangle = 180
Exterior Angle Property = sum of 2 opposite interior sides of a triangle is equal to the 1 exterior angle for example A and B are interior angles of triangle and C is exterior angle and we have dimensions : angle A= 20
angle B = 30
angle C = ?
C = angle A + angle B i.e
20 + 30
50
therefore angle C = 50
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