Area of a circle

area of a circle

Formula – area of a circle

A = π • r²

A – area of a circle

π – number pi = 3,1415

r – radius (distance from the center of the circle to a point on the circle)

Example:

Calculate the area of a circle with a radius of 6 cm.

A = π • r²

A = 3,1415 • (6cm •6cm)

A = 3,1415 • 36 cm²

A = 113,094 cm²

area of a circle - diameter — area of a circle – diameter

The formula for area of a circle

$A=\frac {\pi \cdot d^{2} }{4}$

Description:

A – area of a circle

π – number pi = 3,1415

d – diameter of a circle

Example:

Calculate the area of a circle with a diameter 11 cm.

$A=\frac {\pi \cdot d^{2} }{4}$

$A=\frac {3,1415 \cdot 11^{2} }{4}$

$A=\frac {3,1415 \cdot 121}{4}$

$A=\frac {380,1215}{4}$

$A=95,030375 cm^{2}$

Circle Area Calculator