1.

The measure of one of the exterior angles of a triangle is `100^(@)`. Which of the following is definitely the measure of one of the interior of that triangle?A. `50^(@)`B. `60^(@)`C. `70^(@)`D. `80^(@)`

Answer» Correct Answer - D
If the measure of one of the exterior angles is `100^(@)`, then its supplement is the measure of one of the interior angles of the triangle.
The measure of the required angle `=180^(@)-100^(@)=80^(@)`
Hence, the correct option is (d).


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