Pythagorean Theorem Mr. Parks Algebra Support. Objective The student will be able to: Find the missing side of a right Triangle using the Pythagorean.

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Pythagorean Theorem Mr. Parks Algebra Support

Objective The student will be able to: Find the missing side of a right Triangle using the Pythagorean Theorem

Standard: 3.3 Use Pythagorean Theorem to find the missing side of a right triangle. Vocabulary: 1)Hypotenuse: The side opposite the right angle in a right triangle (the longest side). 2)Pythagorean theorem: a 2 + b 2 = c 2 3)Right triangle: A triangle with one 90 degree angle.

What is a right triangle? It is a triangle which has an angle that is 90 degrees. The two sides that make up the right angle are called legs. The side opposite the right angle is the hypotenuse. leg hypotenuse right angle

The Pythagorean Theorem In a right triangle, if a and b are the measures of the legs and c is the hypotenuse, then a 2 + b 2 = c 2. Note: The hypotenuse, c, is always the longest side.

√1 = 1 √4 = 2 √9 = 3 √16 = 4 √25 = 5 √36 = 6 √49 = 7 √64 = 8 √81 = 9 √100 = 10 √121 = 11 √144 = 12 √169 = 13 √196 = 14 √225= 15 Since 1 2 = 1 Since 2 2 = 4 Since 3 2 = 9 Since 4 2 = 16 Since 5 2 = 25 Since 6 2 = 36 Since 7 2 = 49 Since 8 2 = 64 Since 9 2 = 81 Since 10 2 = 100 Since 11 2 = 121 Since 12 2 = 144 Since 13 2 = 169 Since 14 2 = 196 Since 15 2 = 225 They're Back!!! Remember These?!!! Square Roots…OH NO!

Find the length of the hypotenuse if 1. a = 12 and b = = c = c = c 2 Take the square root of both sides. 20 = c

= c = c 2 74 = c 2 Take the square root of both sides = c Find the length of the hypotenuse if 2. a = 5 and b = 7.

Find the length of the leg, to the nearest hundredth, if 3. a = 4 and c = b 2 = b 2 = 100 Solve for b b 2 = b 2 = 84 b = 9.17

Find the length of the leg, to the nearest hundredth, if 4. c = 10 and b = 7. a = 10 2 a = 100 Solve for a. a 2 = a 2 = 51 a = 7.14

5. The measures of three sides of a triangle are given below. Determine whether each triangle is a right triangle., 3, and 8 Which side is the biggest? The square root of 73 (= 8.5)! This must be the hypotenuse (c). Plug your information into the Pythagorean Theorem. It doesn’t matter which number is a or b.

= = 73 Since this is true, the triangle is a right triangle!! If it was not true, it would not be a right triangle. Sides:, 3, and = ( ) 2