The problem asks us to find the area of the minor segment of a circle. We are given that the central angle of the segment is $60^\circ$ and the radius of the circle is $22$ cm.

GeometryAreaCircleSectorSegmentTriangleEquilateral TriangleTrigonometry
2025/4/26

1. Problem Description

The problem asks us to find the area of the minor segment of a circle. We are given that the central angle of the segment is 6060^\circ and the radius of the circle is 2222 cm.

2. Solution Steps

The area of the minor segment can be found by subtracting the area of the triangle formed by the radii and the chord from the area of the sector formed by the central angle.
First, we find the area of the sector. The area of a sector is given by the formula:
Asector=θ360πr2A_{sector} = \frac{\theta}{360^\circ} \pi r^2
where θ\theta is the central angle in degrees and rr is the radius. In our case, θ=60\theta = 60^\circ and r=22r = 22 cm.
Asector=60360π(22)2=16π(484)=484π6=242π3A_{sector} = \frac{60^\circ}{360^\circ} \pi (22)^2 = \frac{1}{6} \pi (484) = \frac{484\pi}{6} = \frac{242\pi}{3}
Next, we find the area of the triangle. Since the central angle is 6060^\circ and the other two sides are equal to the radius, the triangle is an isosceles triangle. Since one angle is 6060^\circ, the other two angles must also be 6060^\circ, making it an equilateral triangle.
The area of an equilateral triangle with side length ss is given by:
Atriangle=34s2A_{triangle} = \frac{\sqrt{3}}{4} s^2
In our case, s=22s = 22 cm, so:
Atriangle=34(22)2=34(484)=1213A_{triangle} = \frac{\sqrt{3}}{4} (22)^2 = \frac{\sqrt{3}}{4} (484) = 121\sqrt{3}
Now, we subtract the area of the triangle from the area of the sector to find the area of the minor segment:
Asegment=AsectorAtriangle=242π31213=121(2π33)A_{segment} = A_{sector} - A_{triangle} = \frac{242\pi}{3} - 121\sqrt{3} = 121(\frac{2\pi}{3} - \sqrt{3})
Using π3.14159\pi \approx 3.14159 and 31.73205\sqrt{3} \approx 1.73205:
Asegment121(2(3.14159)31.73205)=121(6.2831831.73205)=121(2.094391.73205)=121(0.36234)43.84314A_{segment} \approx 121(\frac{2(3.14159)}{3} - 1.73205) = 121(\frac{6.28318}{3} - 1.73205) = 121(2.09439 - 1.73205) = 121(0.36234) \approx 43.84314

3. Final Answer

The area of the minor segment is 242π31213\frac{242\pi}{3} - 121\sqrt{3} cm2^2, which is approximately 43.8443.84 cm2^2.
Final Answer: The final answer is 242π31213\frac{242\pi}{3} - 121\sqrt{3}

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