137-CBSE Class VI maths, ICSE Class VI maths - Properties of Triangles - Exterior angle property

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Exterior angle of a triangle is always equal to sum of the two non - adjacent interior angles.

Thus, in a Triangle with three angles, A, B and C, the angle which is exterior to : -

A, would be sum of angle B and C
​B, would be sum of angle A and C
C, would be sum of angle A and angle B

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