Diameter & Radius

Diameter & Radius (diameter radius) is a circles relationship written as Diameter = 2 × radius or d = 2r. Students use it to solve unknowns when enough values are known.

Write Diameter = 2 × radius, substitute the known numbers carefully, then simplify. Worked walkthrough: r = 7 d = 14.

Diameter & Radius usually appears in circles units during middle or secondary school. Match difficulty with MathDigits grade worksheets so practice fits the curriculum year.

On this page the worked result is d = 14. Generate a formula worksheet below for more unique practice sets.