Circle measurements
Circumference and area of a circle using π ≈ 3.14: compute the circumference from the radius, the area from the radius, recover the radius from a given circumference, and solve short word problems (pool, wheel, pie).
Available exercises
Area of a circle from the radius
A circle is shown with its radius marked. Compute the area using S = π·r² with π ≈ 3.14.
Word problem — area of a circle
A short story about a round object (pool, wheel, pie). Compute its area using S = π·r².
Circumference of a circle from the radius
A circle is shown with its radius marked. Compute the circumference using O = 2·π·r with π ≈ 3.14.
Find the radius from the circumference
The circumference of a circle is given. Find the radius using O = 2·π·r with π ≈ 3.14.