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Identify Circle, Radius and Diameter Worksheets

Identify the circle, a drawn radius and a diameter in nine labeled diagrams, with all valid radius names in the answer key.

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For each diagram, name the circle, any drawn radius, and a diameter. Either direction is accepted when naming a segment.

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A4

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Start at the center

A radius joins the center to the circle. A diameter joins two circle points and passes through the center.

Learning objective

What this activity builds

Name circles by their centers and distinguish radius segments from full diameters.

Worked example

Circle O has diameter AB and a drawn segment OC to point C on the circle. Name a radius and the diameter.

OA, OB or OC is a radius. AB is the diameter.

Each radius joins the center to the circle. A diameter has both endpoints on the circle and passes through the center.

Teaching notes

Make the practice count

  • Find the center label before naming the circle.
  • Each half of a drawn diameter is also a radius.
  • A diameter must pass through the center.

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Nine rotated diagrams ask for the circle name, any drawn radius, and a true diameter.

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Configured PDF · Identify Circle Parts · US Letter

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Math SheetNameScoreTeacherDateIdentify Circle PartsFor each diagram, name the circle, any drawn radius, and a diameter.Identify circle parts1.Name the circle, any drawn radius, and adiameter.OJKL2.Name the circle, any drawn radius, and adiameter.PBCD3.Name the circle, any drawn radius, and adiameter.QEFG4.Name the circle, any drawn radius, and adiameter.RCDE5.Name the circle, any drawn radius, and adiameter.SYZA6.Name the circle, any drawn radius, and adiameter.TABC7.Name the circle, any drawn radius, and adiameter.UJKL8.Name the circle, any drawn radius, and adiameter.VYZA9.Name the circle, any drawn radius, and adiameter.WEFGA diameter passes through the center and contains two radii.math-sheet.comPage 1 of 1

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