# Worksheet: Area of a Circle

In this worksheet, we will practice finding the area of a circle given its radius or diameter using the formula πr^2 or π(d/2)^2 and solving problems involving quarter circles and semicircles and real-life situations.

**Q3: **

Work out the area of the circle, giving your answer accurate to two decimal places.

**Q4: **

Using the area formula and rounding to the nearest hundredth, find the area of the colored circle.

**Q5: **

Determine, to the nearest square centimeter, the area of the colored region of the given figure.

**Q6: **

How can you use the circumference of a circle to work out its area?

- AYou multiply by its radius squared.
- BYou multiply by its radius and then divide by two.
- CYou multiply by its diameter and then divide by two.
- DYou multiply by its diameter squared.
- EYou multiply by its radius and then multiply by two.

**Q7: **

Emma designed a small circular garden with a diameter of 4.7 m. Determine the area of the garden rounded to the nearest tenth.

**Q8: **

Daniel drew a circle of radius 2 centimeters, and then another of radius 7 centimeters. What is the difference in area between the two, to the nearest square centimeter?

**Q9: **

Using 3.14 as an approximation for , find the area of the circle.

**Q10: **

Determine, to the nearest tenth, the area of the given circle.

**Q11: **

A sprinkler that sprays water in a circular area can be adjusted to spray up to 44 ft. Determine, to the nearest square foot, the maximum area of lawn that can be watered by the sprinkler.

**Q12: **

Charlotte is baking pizzas for her family. Each pizza has a diameter of 6.3 in. Given that each pizza is divided into 6 equal slices. Determine, to the nearest tenth of a square inch, the area of each slice of pizza.

**Q13: **

and are two parallel chords on the same side of a circle. The radius of the circle and the length and is 12 cm and the length of is . Find the area of the part included between the two chords giving the answer to two decimal places.

**Q14: **

The two circles shown in the diagram are concentric. Work out the area of the shaded section, giving your answer in terms of .

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**Q15: **

Given that , work out the area of the semicircle, giving your answer as a fraction of .

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**Q16: **

Given that , work out the area of the semicircle, giving your answer as a fraction of .

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**Q17: **

Circle , of radius 6, is divided into three equal sectors. Calculate the area of each sector, using 3.14 to approximate .

**Q18: **

Work out the area of the semicircle, giving you answer as a fraction of .

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**Q19: **

Work out the area of the circle, giving your answer as a fraction of .

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**Q20: **

If the radius of the smaller circle is 6.6 cm, and the radius of the greater circle is 10.5 cm, determine the area of the shaded part rounded to the nearest hundredth.

**Q21: **

The area of one circle is 4 times the area of another. If the area of the smaller circle is 55.1 square centimeters, determine, to the nearest tenth, the diameter of the larger circle.

**Q22: **

Determine the diameter of a circle whose area is 2,461.76 cm^{2},
taking .

**Q23: **

Work out the area of a circle with a radius of 4 inches, giving your answer to two decimal places.

**Q24: **

The surface of my circular table has diameter 2 m. I want to cover the surface of the table in a sheet of glass and the price of one square meter of glass is 65 LE. Using 3.14 as an estimate for , calculate how much the glass circle will cost me.

**Q25: **

Work out the area of the circle, giving your answer accurate to two decimal places.