1. If a triangle is a RIGHT TRIANGLE, then a2 + b2 = c2.
Pythagorean Theorem
In a RIGHT TRIANGLE, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse.
In other words …
If a triangle is a RIGHT TRIANGLE,
then a2 + b2 = c2.
Proof that the
formula works!
1. Find the length of the missing leg.
9ft 15ft x

2. 2. NAEP Question, Pre-Algebra In the right triangle,
what is the length of AB? A
B. 12
C. 13
D. 17
E. 30
3. Find the length of the missing side.
Round to the nearest tenth.
10 cm
15 cm
4. Find the length of the hypotenuse. 36 15
5. In a right triangle, both legs measure 6 inches. Find the length of the hypotenuse to the nearest tenth.