Diameter of a circle

Calculate the radius, diameter, circumference, or area of a circle, and learn the formulas to find each property of a circle.

Use the radius and diameter measurements to find the area of these circles. Use the link to get the question sheet.

Why is Pi interesting to understand, compute, and perhaps even to search?

A recap of some of the fundamental parts of a circle, including some that are easy to forget: diameter, radius, sector, area, arc, chord, segment, tangent

Get interesting circle facts. See how to find the area, circumference, diameter, and radius of a circle in geometry.

The formula for calculating the circumference (C) of a circle, C = πD or C = 2πR, is simple if you know the circle's diameter (D) or radius (R). But what do you do if you only know the circle's area? Like many things in math, there are...

Calculate the area of a circle given the radius, diameter, or circumference. Plus learn the formulas and steps to find a circle's area.

Explore this comprehensive In Terms of Pi worksheet that delves into various circle topics. Sections A and B focus on circumference and area calculations using either radius or diameter. Section C introduces sector and compound shape perimeter and area concepts, along with a question based on Pythagoras’ Theorem. Additionally, Section D provides practice in converting between area and circumference in terms of pi. Ideal for enhancing your understanding of circles!

Here's how to calculate the circumference, radius, diameter, arc length and degrees, sector areas, inscribed angles, and other shapes of the circle.

Print out circle worksheets for radius, diameter, area and circumference of a circle.