Solve the first 4 questions on your worksheet.

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The Pythagorean Theorem c a b.

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Presentation transcript:

Solve the first 4 questions on your worksheet. Warm Up Solve the first 4 questions on your worksheet.

Pythagoras and the Pythagorean Theorem

Biography of Pythagoras Pythagoras was a Greek mathematician and a philosopher, but was best known for his Pythagorean Theorem. He was born around 572 B.C. on the island of Samos. For about 22 years, Pythagoras spent time traveling though Egypt and Babylonia to educate himself. At about 530 B.C., he settled in a Greek town in southern Italy called Crotona. Pythagoras formed a brotherhood that was an exclusive society devoted to moral, political and social life. This society was known as Pythagoreans.

Biography of Pythagoras The Pythagorean School excelled in many subjects, such as music, medicine and mathematics. In the society, members were known as mathematikoi. History tells us that this theorem has been introduced through drawings, texts, legends, and stories from Babylon, Egypt, and China, dating back to 1800-1500 B.C. Unfortunately, no one is sure who the true founder of the Pythagorean Theorem is. But it does seem certain through many history books that some time in the sixth century B.C., Pythagoras derives a proof for the Pythagorean Theorem.

Right Triangles Longest side is the hypotenuse, side c (opposite the 90o angle) The other two sides are the legs, sides a and b Pythagoras developed a formula for finding the length of the sides of any right triangle

The Pythagorean Theorem “For any right triangle, the sum of the areas of the two small squares is equal to the area of the larger.” a2 + b2 = c2

The Pythagorean Theorem The sum of the squares of each leg of a right angled triangle equals to the square of the hypotenuse a² + b² = c²

Applications The Pythagorean theorem has far-reaching ramifications in other fields (such as the arts), as well as practical applications. The theorem is invaluable when computing distances between two points, such as in navigation and land surveying. Another important application is in the design of ramps. Ramp designs for handicap-accessible sites and for skateboard parks are very much in demand.

Baseball Problem A baseball “diamond” is really a square. You can use the Pythagorean theorem to find distances around a baseball diamond.

Baseball Problem The distance between consecutive bases is 90 feet. How far does a catcher have to throw the ball from home plate to second base?

Baseball Problem To use the Pythagorean theorem to solve for x, find the right angle. Which side is the hypotenuse? Which sides are the legs? Now use: a2 + b2 = c2

Baseball Problem Solution The hypotenuse is the distance from home to second, or side x in the picture. The legs are from home to first and from first to second. Solution: x2 = 902 + 902 = 16,200 x = 127.28 ft

Ladder Problem A ladder leans against a second- story window of a house. If the ladder is 25 meters long, and the base of the ladder is 7 meters from the house, how high is the window?

Ladder Problem Solution First draw a diagram that shows the sides of the right triangle. Label the sides: Ladder is 25 m Distance from house is 7 m Use a2 + b2 = c2 to solve for the missing side. Distance from house: 7 meters

Ladder Problem Solution b = 24 m How did you do?