Math Calculators, Lessons and Formulas
It is time to solve your math problem
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.
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Welcome to MathPortal. This website owner is mathematician Miloš Petrović.
I designed this website and wrote all the lessons, formulas and calculators .
If you want to contact me, probably have some questions write me using the contact form or email me on