A chord of a circle of radius 14 cm subtends an angle of 60° at the centre. Find the area of the corresponding minor segment of the circle.

Answer: The area of the corresponding minor segment of the circle is (3083−493) cm2\left(\frac{308}{3} - 49\sqrt{3}\right) \text{ cm}^2.

Step-by-step solution

Step 1: Identify Given Values

We are given the radius of the circle, r=14 cmr = 14 \text{ cm}, and the angle subtended by the chord at the centre, θ=60∘\theta = 60^\circ. These are the key values needed for our calculations.

Step 2: Calculate Area of Sector

The area of a sector with angle θ\theta and radius rr is given by the formula θ360∘×πr2\frac{\theta}{360^\circ} \times \pi r^2. Substituting the given values, we get 60∘360∘×227×(14)2\frac{60^\circ}{360^\circ} \times \frac{22}{7} \times (14)^2.

Step 3: Simplify Area of Sector

Simplifying the expression, 60∘360∘\frac{60^\circ}{360^\circ} becomes 16\frac{1}{6}. Then, we multiply 16\frac{1}{6} by 227\frac{22}{7} and 196196. This simplifies to 3083 cm2\frac{308}{3} \text{ cm}^2.

Step 4: Calculate Area of Triangle

The area of the triangle formed by the two radii and the chord can be calculated using the formula 12r2sin⁡θ\frac{1}{2} r^2 \sin\theta. Substituting the values, we get 12(14)2sin⁡(60∘)\frac{1}{2} (14)^2 \sin(60^\circ). We know that sin⁡(60∘)=32\sin(60^\circ) = \frac{\sqrt{3}}{2}.

Step 5: Simplify Area of Triangle

Simplifying the expression for the area of the triangle, we multiply 12\frac{1}{2} by 196196 and then by 32\frac{\sqrt{3}}{2}. This results in 493 cm249\sqrt{3} \text{ cm}^2.

Step 6: Calculate Area of Minor Segment

The area of the minor segment is found by subtracting the area of the triangle from the area of the sector. So, we subtract 49349\sqrt{3} from 3083\frac{308}{3}.

More from this chapter

All Areas Related to Circles solutions →

Solve your own maths question free →