2024 · Q72
If p is the perimeter of the smallest sector, then what is the value of 9p?
Elementary MathematicsCircles
- A142 cm
- B148 cm
- C156 cm
- D221 cm
Explanation
The smallest sector has radius 7 cm and central angle 20°. Its perimeter is p = 2 × 7 + (20/360) × 2π × 7 = 14 + 22/9 = 148/9. Therefore 9p = 148, option (b).