1. Lesson 7-2: Pythagorean Theorem

2. Pythagorean Theorem In a ________ ________, the sum of the squares of the ______ of a right triangle will equal the square of the ____________. Better know as: But I like to write: “Leg squared plus leg squared equals hypotenuse squared.” leg hypotenuse legs triangleright hypotenuse

3. Using Pyth. Theorem When looking for the ___________: When looking for one of the _____: Hypotenuse = “add the square of the two ________ sides, then ________ ________” Leg = “subtract the square of the ____________ and other _______, then ________ ________” hypotenuse legs squareroot legs hypotenuse legsquare root Square-Add- Square Root Square-Subtract- Square Root

4. Converse of the Pyth. Thrm. Converse just means ____________ This allows us to say if a triangle is __________ or _____________ → _______________ → ________________ Pythagorean __________ A group of three whole numbers that are possible lengths in a right triangle. 2 popular sets: ________ and ________ ___________ of these 2 are also Pythagorean Triples. backwards acute obtuse Acute triangle Obtuse triangle Triple 3, 4, 55, 12, 13 a b c b a c Multiples

5. Example 2-2c Find x. Answer: Example 1

6. Example 2-4a Determine whether 9, 12, and 15 are the sides of a right triangle. Then state whether they form a Pythagorean triple. Since the measure of the longest side is 15, 15 must be c. Let a and b be 9 and 12. Pythagorean Theorem Simplify. Add. Example 2

7. Example 3 Is a triangle with sides 3, 8, 10 acute, right, or obtuse?