What is a right triangle?

Take a look at the following picture:

http://t2.gstatic.com/images?q=tbn:ANd9GcTFlmiOf_-ZbmVBrDlclPAUNLTWnZx4A7nE8ac_fca0vFo--VZE

Things to notice:

• A right triangle contains a right angle.

• This right angle can be (not always) represented by a box in the corner.

• Right angles measure to be 90 degrees using a protractor.

go back to Activity Two: Proof Behind the Pythagorean Theorem