Learn Pythagoras' Theorem part 2: Sides
Learn to use the relationship
Teacher version
Interactive lesson part 1
Interactive lesson all in one
The big deal about the Pythagorean theorem is that the squares help us to calculate the sides of the right triangle.
Use the square root button on your calculator to find the length of each side of the triangle in the next applet.
In the next applet, two sides are given. Complete all the answer boxes.
To find the area of the third square, you will need to either add or to subtract the areas of the other two squares.
In this final applet the squares are hidden and the triangle rotates on each new question. You can imagine the squares on each side, or you can click on the 'show squares' button.
Calculate the areas of the squares, then calculate the length of the missing side.