Warm Up Use a calculator to find each value. Round to the nearest hundredth. 1. √30 2. √14 3. √55 4. √48 5.48 3.74 7.42 6.93.

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Presentation transcript:

Warm Up Use a calculator to find each value. Round to the nearest hundredth. 1. √30 2. √14 3. √55 4. √48 5.48 3.74 7.42 6.93

Problem of the Day A side of a square A is 5 times the length of a side of square B. How many times as great is the area of square A than the area of square B? 25

The Pythagorean Theorem TB P. 196-199 Learn to use the Pythagorean Theorem and its converse to solve problems. Course 3

Vocabulary Pythagorean Theorem leg hypotenuse

Pythagoras was born on the Aegean island of Samos Pythagoras was born on the Aegean island of Samos. He is best known for the Pythagorean Theorem, which relates the side lengths of a right triangle.

Additional Example 1A: Finding the Length of a Hypotenuse Find the length of the hypotenuse to the nearest hundredth. c 4 5 a2 + b2 = c2 Pythagorean Theorem 42 + 52 = c2 Substitute for a and b. 16 + 25 = c2 Simplify powers. 41 = c2 41 = c Solve for c; c = c2. 6.40  c

Additional Example 1B: Finding the Length of a Hypotenuse Find the length of the hypotenuse to the nearest hundredth. triangle with coordinates (1, –2), (1, 7), and (13, –2) a2 + b2 = c2 Pythagorean Theorem 92 + 122 = c2 Substitute for a and b. 81 + 144 = c2 Simplify powers. 225 = c Solve for c; c = c2. 15 = c

Additional Example 2: Finding the Length of a Leg in a Right Triangle Solve for the unknown side in the right triangle to the nearest tenth. a2 + b2 = c2 Pythagorean Theorem 25 b 72 + b2 = 252 Substitute for a and c. 49 + b2 = 625 Simplify powers. –49 –49 Subtract 49 from each side. b2 = 576 7 b = 24 Find the positive square root.

Additional Example 3: Using the Pythagorean Theorem for Measurement Two airplanes leave the same airport at the same time. The first plane flies to a landing strip 350 miles south, while the other plane flies to an airport 725 miles west. How far apart are the two planes after they land? a2 + b2 = c2 Pythagorean Theorem 3502 + 7252 = c2 Substitute for a and b. 122,500 + 525,625 = c2 Simplify powers. 648,125 = c2 Add. 805 ≈ c Find the positive square root. The two planes are approximately 805 miles apart.

Lesson Quiz Use the figure for Problems 1 and 2. 1. Find the height h of the triangle. 8 m 2. Find the length of side c to the nearest meter. 10 m c h 12 m 3. An escalator in a shopping mall is 40 ft long and 32 ft tall. What distance does the escalator carry shoppers? 6 m 9 m 2624 ≈ 51 ft