In this lesson our instructor talks about using the Pythagorean Theorem. First she talks about finding the length of a leg and does several examples. Next she talks about identifying a right triangle and does two more examples. Four complete extra example videos round up this lesson.
A right triangle is a triangle
with one right, 90°, angle. It has two legs, which are the shorter
sides. The hypotenuse is the longest side and is the diagonal; it‘s
the side across from the right angle.
The Pythagorean Theorem, a2
+ b2 = c2, shows how the lengths of the sides
in a right triangle are related. The sum of the squares of the legs
is equal to the hypotenuse.
The letters a, b, and c are
commonly used to represent the sides of a right triangle. a and b
are used to represent the legs and c is used to represent the
You can use different forms of
the Pythagorean Theorem to find the measurement of either leg, or
You can use the Pythagorean
Theorem to determine whether a triangle is a right triangle. If the
sum of the squares of the legs does not equal the hypotenuse the
triangle is not a right triangle.
Using the Pythagorean Theorem
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.