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Why is the exterior angle of a triangle equal to the two opposite interor angles?
in Grade 8 Maths by Diamond (37.9k points) | 44 views

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Its because the third angle inside triangle is equal to 180 minus sum of 2 angles.

However this third angle if subtracted from the external angle along the straight line will give again the sum of two opposite angles.
by Silver Status (28.5k points)

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