2016 · Q54
If each interior angle of a regular polygon is 140°, then the number of vertices of the polygon is equal to
Elementary MathematicsQuadrilaterals and Polygons
- A10
- B9
- C8
- D7
Explanation
Each interior angle of a regular n-gon is (n−2)·180°/n. Setting this equal to 140° gives 40n = 360. Hence n = 9 vertices, option B.