Square and Rectangle Calculator
Scroll down for Instructions and Definitions
Click here to see information for all quadrilaterals.
For a trapezoid calculator, click here trapezoids.
For a kite calculator, click here kites.
For a parallelogram calculator, click here parallelograms.
For a rhombus calculator, click here rhombuses.
Scroll down for equations
First, click on one of the 4 choices, enter the data in the
appropriate input boxes, then click "CALCULATE".
This calculator displays a huge amount of data for a small amount of input.
For example, just by
inputting the diagonal of a square (choice #2) your output will show the area
of the square, the perimeter, the length of 1 side, and so on.
The Square and the Rectangle
All angles equal 90°.
Lines AC and BD are called diagonals.
The diagonals are equal.
The diagonals bisect each other.
Each diagonal forms 2 pairs of congruent triangles.
Δ ADC = Δ BCD and Δ ACB = Δ BDA
• DIAGONALS MEET AT RIGHT ANGLES
• ALL FOUR SIDES EQUAL
• BOTH pairs of opposite sides are equal.
AB = DC and AD = BC
• Line 'h' is perpendicular to lines AB & DC and is
called the height or altitude.
The default setting is for 5 significant figures but you can change that
by inputting another number in the box above.
Answers are displayed in scientific notation and for easier readability, numbers between
.001 and 1,000 will be displayed in standard format (with the same number of
The answers should display properly but there are a few browsers that will show
no output whatsoever. If so, enter a zero
in the box above. This eliminates all formatting but it is better than seeing no
output at all.
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