Circle areaRadius or diameter
Name: Date:
Find the area of each circle. Use π = 3.14.
1 cm²
2 cm²
3 cm²
4 cm²
5 cm²
6 cm²
7 cm²
8 cm²
Area of a circle worksheets
Area of a circle squares the radius, which means getting the radius wrong costs four times over. These free printable worksheets hand a child either measurement and let them sort it out.
If they get stuck
Area of a circle
The answer key prints on a separate page.
What's on this sheet
Given a diameter, the first move is halving it, and skipping that step is the single most common error on this topic. It is not a careless slip — the two formulas look alike and both involve one number and pi — so the mixed sheets deliberately alternate, and a child has to read the figure every time rather than settle into a rhythm.
Why this sheet works
Diameters stay even on the area sheets, so halving never produces a fraction. The point of the practice is the formula and the squaring, not decimal arithmetic sneaking in through the back door.
How this one works
Area of a circle marked 4 cm
- The 4 cm marked here goes right ACROSS the circle — it is the diameter, not the radius. The area formula wants the radius, so that is the first thing to sort out.
- Half of 4 is 2, so the radius is 2 cm. Skipping this step is what makes an area come out four times too big.
- Area is π × r × r. Square the RADIUS first — only the r is squared, not the π with it: 2 × 2 = 4.
- Then multiply by π: 4 × 3.14 = 12.56 square cm.