The formula for the field of circles

wheel field
wheel field

The formula for the area of ​​a circle

P = Pi • r2

Legend:

P – the area of ​​the circle

Pi – number pi = 3,1415

r – radius of the circle

Sample task:

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

P = Pi • r2

P = 3,1415 • (6cm •6cm)

P = 3,1415 • 36 cm2

P = 113,094 cm2

 

 

area of ​​the circle
area of ​​the circle

 

The formula for the area of ​​a circle

P=\frac {\pi \cdot d^{2} }{4}

Legend:

P – the area of ​​the circle

Pi – number pi = 3,1415

d – Diameter of a circle

 

Sample task:

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

P=\frac {\pi \cdot d^{2} }{4}

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

P=\frac {3,1415 \cdot 121}{4}

P=\frac {380,1215}{4}

P=95,030375 cm^{2}

Circle Area Calculator ⇓

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