2019 · Q28
The area of a sector of a circle of radius 4 cm is 25.6 cm². What is the radian measure of the arc of the sector?
Elementary MathematicsCircles
- A2.3
- B3.2
- C3.3
- D3.4
Explanation
Sector area = (1/2)r^2.theta: 25.6 = (1/2)x16x.theta, so theta = 3.2 radians. (Trap: confusing arc length r.theta with area.)