All ACT Math Resources
Example Question #1 : How To Find The Length Of The Diagonal Of A Quadrilateral
A square has a length of . What must be the length of the diagonal?
A square with a length of indicates that all sides are since a square has 4 equal sides. Use the Pythagorean Theorem to solve for the diagonal.
Example Question #3 : Other Quadrilaterals
If the rectangle has side lengths of and , what is the diagonal of the rectangle?
Use the Pythagorean Theorem to solve for the diagonal.
Example Question #2 : How To Find The Length Of The Diagonal Of A Quadrilateral
In the parallelogram above, and . What is the length of the diagonal ?
In a parallelogram, the two diagonals bisect each other at their centers. Therefore, . To find , we set them equal to one another and solve.
Plugging this value back into both equations, then adding those values together, gives us our answer of .