Middle School

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Consider circle C with a radius of 5 cm and a central angle measure of 60°.

Circle C is shown. Line segments RC and SC are radii with lengths of 5 centimeters. Angle RCS is 60 degrees.

1. What fraction of the whole circle is arc RS?
2. What is the approximate circumference of the circle? (cm)
3. What is the approximate length of arc RS? (cm)

Answer :

Final answer:

The fraction of the whole circle that arc RS represents is 1/6. The approximate circumference of the circle is 31.4 cm. The approximate length of arc RS is 5.24 cm.

Explanation:

The fraction of the whole circle that arc RS represents can be found by comparing the measure of the central angle R C S to the measure of a full circle, which is 360 degrees. In this case, the central angle measure is 60 degrees, so the fraction of the whole circle that arc RS represents is 60/360, which simplifies to 1/6.

The circumference of a circle can be found using the formula C = 2πr, where r is the radius. In this case, the radius is 5 cm. So, the approximate circumference of the circle is approximately 2 × 3.14 × 5, which simplifies to approximately 31.4 cm.

The length of an arc can be found using the formula L = 2πr (θ/360), where r is the radius and θ is the measure of the central angle. In this case, the radius is 5 cm and the central angle measure is 60 degrees.

So, the approximate length of arc RS is approximately 2 × 3.14 × 5 (60/360), which simplifies to approximately 5.24 cm.

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Rewritten by : Jeany