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Circle measurements worksheets

Find radius, diameter, circumference and area in nine circles from a supplied radius or diameter. Choose any of five units, use pi = 3.14, and optionally print the formulas.

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Use pi = 3.14, an approximation to pi. Find the radius, diameter, circumference and area of each circle. Diagrams are not to scale.

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Connect all four circle measurements

Every sheet has nine circles. Each question supplies either a radius or a diameter, then asks for the other dimension, circumference and area. The diagrams show both segments clearly but are not drawn to the stated scale.

Use pi = 3.14 throughout. Double or halve to connect radius and diameter, use C = pi × d for circumference, and use A = pi × r² for area. Radius, diameter and circumference use linear units; area uses square units.

Learning objective

What this activity builds

Connect radius and diameter, then use pi = 3.14 to calculate circumference and area with correct linear and square units.

Worked example

A circle has radius 5 cm. What are its diameter, circumference and area using pi = 3.14?

Diameter = 10 cm; circumference = 31.4 cm; area = 78.5 cm².

Double the radius for diameter. Then calculate C = 3.14 × 10 and A = 3.14 × 5 × 5. Circumference uses cm, while area uses cm².

Teaching notes

Make the practice count

  • Mark whether the supplied segment is a radius or a diameter before calculating.
  • Double a radius to get diameter and halve a diameter to get radius.
  • Use the diameter in C = pi × d and the radius in A = pi × r².
  • Keep linear units on radius, diameter and circumference, and square the unit only for area.

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Math SheetNameScore/ 27TeacherDateCircle measurementsUse pi = 3.14, an approximation to pi. Find the radius, diameter, circumference and area of each circle. Diagrams are not to scale.1.drRadius:6 inDiameter:Circumference:Area:2.drRadius:18 inDiameter:Circumference:Area:3.drRadius:Diameter:18 inCircumference:Area:4.drRadius:5 inDiameter:Circumference:Area:5.drRadius:Diameter:32 inCircumference:Area:6.drRadius:10 inDiameter:Circumference:Area:7.drRadius:Diameter:16 inCircumference:Area:8.drRadius:Diameter:40 inCircumference:Area:9.drRadius:Diameter:6 inCircumference:Area:math-sheet.comPage 1 / 1

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