Answer:
The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.
Properties of Circles
r is the length of the radius.
d is the length of the diameter.
d=2r.
Circumference is the perimeter of a circle. The formula for circumference is C=2πr.
The formula for area of a circle is A=πr2.
Step-by-step explanation:
To evaluate the dimensions of a circle, determine what information you need and apply the appropriate formula:
1. The area is equal to pi multiplied by the square of the radius: a=π⋅r2.
2. The perimeter of a circle (called the circumference) is equal to pi times the diameter: C=π⋅d.
To work out the area of a square or rectangle, multiply its height by its width. If the height and width are in cm, the area is shown in cm². If the height and width are in m, the area is shown in m². A square with sides of 5 m has an area of 25 m², because 5 × 5 = 25.
