Area of a circle

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

Use the radius measurements to find the area of these circles.

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...

How to calculate the circumference of a circle using the circumference formula. See also some real-world examples that are easy to understand.

Browse over 170 educational resources created by MSci Resources in the official Teachers Pay Teachers store.

Different ways to calculate the area of a circle using the value of pi is what this lesson will teach you.

CBSE Class 10 Maths Notes Chapter 12 Areas related to Circles Pdf free download is part of Class 10 Maths Notes for Quick Revision. Here we have given NCERT Class 10 Maths Notes Chapter 12 Areas related to Circles.

Work up an appetite for geometry! With this pizza circle sheet, your student will practice finding the radius, diameter, circumference and area of a circle.

We will learn how to find the Area and perimeter of a semicircle and Quadrant of a circle. Area of a semicircle = 1/2 ∙ πr^2 Perimeter of a semicircle = (π + 2)r. because a semicircle is a sector of sectorial angle 180°. Area of a quadrant of a circle = 1/4 ∙ πr^2.