DrillPre-K to K
Shape recognition worksheets
Circle or color the circles, squares, triangles and rectangles hidden in each row.
Circumference and area of circles
Find the circumference and area of a circle from its radius or diameter, in terms of pi or rounded to the hundredth.
About this worksheet
Each circle is drawn with its radius or its diameter labeled. Students use C = 2πr and A = πr². Choose circumference, area or both, a radius or a diameter in the picture (or a mix), and whether to leave pi in the answer (14π) or to round to the hundredth with a calculator.
Every radius is a whole number, so answers in terms of pi are whole numbers of pi. The decimal answers are checked so that none sits on a rounding edge, and the answer key shows every answer.
Printing
US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.
Popular versions
Ready-made settings for common topics.
- Circumference of a circle in terms of pi worksheets
- Area of a circle in terms of pi worksheets
- Circumference of a circle rounded to the hundredth worksheets
- Area of a circle rounded to the hundredth worksheets
- Circumference and area of circles with a calculator worksheets
- Circle circumference and area from the radius worksheets
- Circle circumference and area from the diameter worksheets
- Circumference and area of circles with small radii worksheets
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