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# Circle Worksheets

This generator makes worksheets for calculating the radius, diameter, circumference, or area of a circle, when one of those is given (either radius, diameter, circumference, or area is given). They can be made in PDF or html formats.

Options are numerous: you can choose metric or customary units or both, you can include or not include simple circle images in the problems, or randomly let some problems have a circle image and some not. You can also choose either 3.14 or 3.1416 as a value of Pi in the calculations, and then choose the rounding accuracy for the answers. Please change the different options to see what their effect is.

After you have generated a worksheet, you can just refresh the page from your browser window (or hit F5) to get another worksheet with different problems but using the same options.

All worksheets come with an answer key.  You can print the worksheet directly from your browser, or save it on disk using the "Save as" command of your browser.  If the problems on the worksheet don't fit the page or there is not enough working space, choose a smaller font, less cellpadding, or fewer columns of problems.

## Example worksheets (circumference, diameter, radius, area of circle)

 Columns:   Rows: (These determine the number of problems) Workspace: empty lines Use metric units (mm, cm, m, km, mm2, cm2, m2, km2) Use customary units (in, ft, yd, mi, in2, ft2, yd2, mi2) Use Pi = 3.14 in calculations Use Pi = 3.1416 in calculations Use Pi = 3.14159265 in calculations Round the answer to decimal digits Use circle images in all problems. Do not use circle images in any problems. Use circle images in some problems (randomly). Choose problem types. Tick at least one box. The radius is given. Calculate the diameter of the circle. The circumference is given. Calculate the diameter of the circle. The area is given. Calculate the diameter of the circle. The diameter is given. Calculate the radius of the circle. The circumference is given. Calculate the radius of the circle. The area is given. Calculate the radius of the circle. The radius is given. Calculate the circumference of the circle. The diameter is given. Calculate the circumference of the circle. The area is given. Calculate the circumference of the circle. The radius is given. Find the area of the circle. The diameter is given. Find the area of the circle. The circumference is given. Find the area of the circle. Bordercolor: red blue purple teal green orange gray black Page orientation: Portrait   Landscape (PDF worksheet only; the orientation of an html worksheet can be set in the print preview of the browser) Font: Arial Courier Courier New Helvetica sans-serif Times New Roman Verdana Font Size:  8pt 9pt 10pt 11pt 12pt 13pt 14pt 16pt 18pt 24pt Cell Padding: Additional title & instructions  (HTML allowed)

#### Key to Geometry Workbooks

Here is a non-intimidating way to prepare students for formal geometry. Key to Geometry workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.