Worksheet: Radius of a Circle

In this worksheet, we will practice finding the radius or the diameter of a circle given its circumference.

Q1:

Using 2 2 7 to approximate πœ‹ , what is the radius of a circle of circumference 264 cm?

Q2:

If the circumference of a circle equals 1 7 . 1 6 πœ‹ cm, find its radius.

Q3:

Half the circumference of a certain circle is 392.5 cm. Determine its diameter, using 3.14 in place of πœ‹ .

Q4:

Work out the radius of a circle with a circumference of 19 inches, giving your answer to two decimal places.

Q5:

The perimeter of a square is twice the circumference of a certain circle. Given that the side of the square is 423.9 cm and using 3.14 to approximate πœ‹ , determine the diameter of the circle.

Q6:

A wheel covers a distance of 4 312 m after 98 cycles. Using 2 2 7 in place of πœ‹ , find the wheel’s diameter.

Q7:

Suppose you walk around the edge of a circular fountain and measure its circumference to be 316 feet. Based on your measurement, what is the diameter of the fountain rounded to the nearest unit?

Q8:

A circle has a circumference of 40 cm.

Calculate the radius of the circle accurate to three decimal places.

Use this value to calculate the area of the circle, giving your answer accurate to one decimal place.

Q9:

Half the circumference of a certain circle is 863.5 cm. Determine its diameter, using 3.14 in place of πœ‹ .

Q10:

Half the circumference of a certain circle is 549.5 cm. Determine its diameter, using 3.14 in place of πœ‹ .

Q11:

The perimeter of a square is twice the circumference of a certain circle. Given that the side of the square is 675.1 cm and using 3.14 to approximate πœ‹ , determine the diameter of the circle.

Q12:

The perimeter of a square is twice the circumference of a certain circle. Given that the side of the square is 863.5 cm and using 3.14 to approximate πœ‹ , determine the diameter of the circle.

Q13:

If the circumference of a circle equals 2 1 . 4 8 πœ‹ cm, find its radius.

Q14:

If the circumference of a circle equals 4 2 πœ‹ cm, find its radius.

Q15:

Using 3.14 to approximate πœ‹ , what is the radius of a circle of circumference 345.4 cm?

Q16:

A wheel covers a distance of 3 972.1 m after 23 cycles. Using 3.14 in place of πœ‹ , find the wheel’s diameter.

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