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In this lesson, we will learn how to find the radius or the diameter of a circle given its circumference.

Q1:

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

Q2:

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?

Q3:

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

Q4:

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

Q5:

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

Q6:

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 , determine the diameter of the circle.

Q7:

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 , determine the diameter of the circle.

Q8:

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 , determine the diameter of the circle.

Q9:

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

Q10:

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

Q11:

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

Q12:

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

Q13:

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

Q14:

A wheel covers a distance of 4β312 m after 98 cycles. Using 2 2 7 in place of π , find the wheelβs diameter.

Q15:

A wheel covers a distance of 3β972.1 m after 23 cycles. Using 3.14 in place of π , find the wheelβs diameter.

Q16:

A wheel covers a distance of 3β265.6 m after 52 cycles. Using 3.14 in place of π , find the wheelβs diameter.

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