Question

What are exterior angles of any polygon?

(a) All angles within the polygon

(b) The angles with measure as 90°

(c) The angles forming a pair of supplementary angles

(d) The angles forming a pair of complementary angles

The question was asked in class test.

This key question is from Sum of Measures of the Exterior Angles of a Polygon topic in section Quadrilaterals of Mathematics – Class 8

Answer 1

Right option is (c) The angles forming a pair of supplementary angles

For explanation I would say: If an extended ray along a side of a polygon form a linear pair with the same side of the polygon then the angle made by the polygon and the extended ray is said to be exterior angle of that polygon. Any polygon having ‘n’ number of sides the sum of all external angels is 360°.