Radius to diameter

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Steps in this unit · Circles

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← L and mL together Diameter to radius →

Circles · Shapes & Geometry

Learn radius and diameter: the diameter is twice the radius.

This is step 1 of unit 7, “Circles”, in Stage 4: Multiplying, dividing and first fractions (ages 10). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.