7-3-ext Providingthe thePythagorean PythagoreanTheorem Theorem 7-3-ext Providing Lesson

7-3-ext Providingthe thePythagorean PythagoreanTheorem Theorem 7-3-ext Providing Lesson

7-3-ext Providingthe thePythagorean PythagoreanTheorem Theorem 7-3-ext Providing Lesson Presentation Holt Holt McDougal Geometry Geometry

Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Objectives Prove the Pythagorean Theorem using similar Triangles. Holt McDougal Geometry 7-3-ext

Providing the Pythagorean Theorem The Pythagorean Theorem is one of the most widely used and well-known mathematical theorems. The theorem has been proven in many different ways, some of which involve subdividing the triangle in some way. The following proof uses similar triangles. Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem

Example 1:Proving the Pythagorean Theorem Using Similar Triangles For the figure, find b, c, and f. Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Example 1: Continued Find b: 322 + 242 = b2 1024 + 576 = b2 1600 = b2

Find f: 40=b f2 + 242 = 302 f2 + 576 = 900 f2 = 324 f = 18 Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Example 1: Continued

Find c: c = 32 + f c = 32 + 18 c = 50 Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Check It Out! Example 1 In the figure, find c, e, and f.

Find e: e2 + 122 = 202 e2 + 144 = 400 e2 = 256 e = 16 Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Check It Out! Example 1 Continued Find f: f2 + 122 = 152 f2 + 144 = 225

f2 = 81 f=9 Find c: c=e+f c = 16 + 9 c = 25 Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Example 2: Applying the Pythagorean Theorem

Megan, Tia, and Carla are running a relay race. Megan runs the first leg, 6.5 miles northwest. Tia runs the second leg, 4.0 miles south. How far east does Carla need to run to complete the race? Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Example 2 : Continued a 2 + b2 = c 2 42 + b2 = 6.52 16 + b2 = 42.25

b2 = 26.25 ~~ 5.1 b Carla needs to run about 5.1 miles. Holt McDougal Geometry 7-3-ext Providing the Pythagorean Theorem Check It Out! Example 2 Jackie drives 5 miles east and 3 miles north from home to school. What is the shortest

distance from Jackies home to school? a2 + b2 = c 2 52 + 32 = c2 25 + 9 = c2 34 = c2 ~ 5.8 c~ The school is approximately 5.8 miles from her home. Holt McDougal Geometry

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