# Area of a Circle Worksheets

1. Math >
2. Geometry >
3. Area >
4. Circles

This collection of area of circle worksheets provides comprehensive practice in calculating the area of circles using the value of pi (π), finding radius and diameter from area, and determining the area of an annulus. The included answer key makes the whole set twice as exciting! Practice with these free worksheets to master these concepts.

Select the Measurement Units

Finding Area When Radius Is Given

The area of a circle refers to the amount of flat surface enclosed within its circumference. Plug the value of the radius (r) into the formula A = πr2. Use the value of π ≈ 3.14 and round your answers to the nearest tenth.

Finding Area in Terms of Pi When Radius Is Given

Determine the area of each circle in terms of pi in these pdfs for grade 7 and grade 8. Since the formula for the area of a circle = pi * (radius)2, find the square of the radius and write the answers in terms of π.

Finding Area When Diameter Is Given

The diameter (d) of a circle is the distance across the circle passing through its center. Work through this set of area of circle worksheets by substituting the given values of diameter. To calculate the radius, use r = d/2.

Finding Area in Terms of Pi When Diameter Is Given

Given the diameter, apply the formula r = d/2 to find the radius. Then substitute the values into the area formula A = πr2 and simplify. Remember to express the area using the variable pi (π) instead of a numerical value.

Finding the Area Using Radius or Diameter

This exercise features either the radius or diameter values. Based on the measurement given, use the appropriate formula (A = πr2 or A = πx(d2/4)). Insert the provided value into the formula and perform the calculations.

Solve our finding the radius from the area worksheets, available in customary and metric units. Plug in the known values into the area formula and then isolate r2 on one side. After dividing the area by 3.14, find its square root.

Finding Diameter from Area

The diameter of a circle is twice the radius. Substitute the known values into the area formula to determine the value of the radius. Then, multiply r by 2 to get the diameter, and round your answer to the nearest tenth.

Finding Area of an Annulus in Terms of Pi

Plug in the dimensions in the formula A = πR2 − πr2, where R is the radius of the outer circle, and r is the radius of the inner circle to compute the area. Solve these printables by finding the area of an annulus in terms of pi.

Finding Area of an Annulus | Integers

Look for the values of the larger radius (R) and the smaller radius (r) for each figure in these area of an annulus worksheets. Use the provided values of R and r in the formula A = π(R2 - r2).

Finding Area of an Annulus | Decimals

This set features exercises with increased difficulty levels, focusing on finding the area of shaded regions with decimal dimensions. Assist young learners in quickly determining the area of an annulus.

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