2020 · Q50
What is the magnitude (in radian) of the interior angle of a regular pentagon?
Elementary MathematicsQuadrilaterals and Polygons
- Aπ/5
- B2π/5
- C3π/5
- D4π/5
Explanation
Interior angle = (5-2)*180/5 = 108 degrees = 3*pi/5. Hence option (C). Equivalently 108/180 = 3/5 of a half-turn, giving 3*pi/5 radians.