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Geometry calculators

Find circle length and area, rectangle perimeter and area.

Circle

image/svg+xml R

Area of circle equals πR2:

=
×

Circle length equals 2πR:

=
2
×
×

Rectangle

image/svg+xml a b

Area of rectangle equals a × b:

=
×

Perimeter of rectangle equals 2A + 2B:

=
2
×
+
2
×