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# Rectangle calculator

An online calculator that calculates the side, area, perimeter and diagonal of a rectangle if you enter two known values. Step-by-step explanations for each combination of input parameters are provided.

Rectangle Calculator
Input value you know and select what to compute.
show help ↓↓ examples ↓↓
I want to calculate:
Input two elements of a rectangle
use letter r to input square root. Ex: $3\sqrt{2} = \text{3r2}$
side $a$
=
side $b$
=
area $A$
=
perimeter $P$
=
diagonal $d$
=

working...
examples
example 1:ex 1:
Find the area of the rectangle whose sides are $14cm$ and $31 cm$.
example 2:ex 2:
Finding the area of a rectangle whose diagonal is $9 cm$ and one side is $5 cm$.
example 3:ex 3:
The area of a rectangle is $56 cm^2$ and one side is $6 cm$. Find perimeter.

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