2024 · Q40
What is the area of the region between two concentric circles, if the length of a chord of the outer circle touching the inner circle at a particular point of its circumference is 14 cm ? (Takе π = 22/7)
Elementary MathematicsCircles
- A154 square cm
- B144 square cm
- C132 square cm
- DCannot be determined due to insufficient data
Explanation
If the half-chord is 7 cm, Pythagoras gives R² − r² = 49. The annulus area is π(R² − r²) = (22/7) × 49. That equals 154 sq cm, option (a).