CircumferenceDiameter given
Name: Date:
Find the circumference of each circle. Use π = 3.14.
1 cm
2 cm
3 cm
4 cm
5 cm
6 cm
7 cm
8 cm
Circumference from the diameter worksheets
The circumference is pi times the diameter, and when the diameter is what you are handed there is nothing to convert first — one multiplication and you are done. These free printable worksheets keep to that one case, with pi = 3.14.
If they get stuck
Circumference from the diameter
The answer key prints on a separate page.
What's on this sheet
The mixed circumference sheets label some circles with a radius and some with a diameter, so a child has to double or not depending on the figure. This one is diameter throughout, which makes it the cleaner starting point: C = pi × d directly, no doubling step, so the whole of the work is the multiplication and reading the unit.
Why this sheet works
The number is printed on a chord straight across the middle, so a child can see it is the full width rather than a spoke from the center. Getting that reading right is what keeps this from being confused with the radius sheets, where the first move is to double.
How this one works
One question from a sheet like this one, worked a step at a time — with a sentence saying what just happened and why.
Circumference from the diameter, step by step