Test
Circumference and area of a circle
Dynamic tasks on radius, diameter, circumference and the area of a circle and its parts, using π ≈ 3.14.
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Sample questions
- The radius of a circle is ___ cm. Find its diameter.
- The radius is ___ cm. Calculate the circumference using π ≈ 3.14.
- The radius of a circle is ___ cm. Calculate its area using π ≈ 3.14.
- A semicircle has radius ___ cm. Calculate the area of the semicircle using π ≈ 3.14.
- A quarter-circle has radius ___ cm. Calculate only the arc length using π ≈ 3.14.
Circumference and area of a circle
The circumference is the boundary of a circular region. Radius r joins the centre to the boundary, while diameter d = 2r passes through the centre. Circumference C = 2πr = πd and area A = πr².
Parts of a circle
Divide the full area by 2 or 4 for a half or quarter. Use the stated value of π. Circumference uses units of length, while area uses square units.
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