8-2 - Study Guide and Intervention
Chapter 8. 11. Glencoe Geometry. Study Guide and Intervention. The Pythagorean Theorem and Its Converse. The Pythagorean Theorem In a right triangle
8-2 Study Guide and Intervention - The Pythagorean Theorem and
Chapter 8. 11. Glencoe Geometry. 8-2 Study Guide and Intervention. The Pythagorean Theorem and Its Converse. The Pythagorean Theorem In a right triangle
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Two lines and a transversal form eight angles. Chapter 8 11 Glencoe Geometry Study Guide and Intervention The Pythagorean Theorem and Its. Converse The
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8-2. Study Guide and Intervention (continued). The Pythagorean Theorem and Its Converse. Converse of the Pythagorean Theorem If the sum of the squares.
8-3 Study Guide and Intervention - Special Right Triangles
Chapter 8. 18. Glencoe Geometry. 8-3 Study Guide and Intervention. Special Right Triangles Using the Pythagorean Theorem with a = b = x then. 2.
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NAME DATE PERIOD 8-2 Study Guide and Intervention
The Pythagorean Theorem and Its Converse The Pythagorean Theorem In a right triangle the sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse If the three whole numbers ab and c satisfy the equation a2 + 2b = c2 then the numbers a b and c form a Pythagorean triple c a b A C B a Find a a 12
The Pythagorean Theorem and Its Converse
The Pythagorean Theorem In a right triangle the sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse If the three whole numbers a b and c satisfy the equation 2 + 2 = 2 then the numbers a b and c form a Pythagorean triple Example : Find a Find c ABC is a right triangle so 2 + 2 = 2
The Pythagorean Theorem and Its Converse
The Pythagorean TheoremIn a right triangle the sum of the squares of the measures of the legs equals the square of the measure of the hypotenuse 2ABCis a right triangle so a b2c2 Prove the Pythagorean Theorem With altitude CD each leg aand bis a geometric mean between hypotenuse cand the segment of the hypotenuse adjacent to that leg a c 2
Lesson 8-2
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Compan ies, Inc.NAME DATE PERIOD
Chapter 8 11 Glencoe Geometry
Study Guide and Intervention
The Pythagorean Theorem and Its Converse
The Pythagorean Theorem In a right triangle, the sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse. If the three whole numbers a , b, and c satisfy the equation a2 + b 2 = c 2 , then the numbers a , b, and c form aPythagorean triple.
ca b ACB a. Find a. a 1213ACB a2 + b 2 = c 2
Pythagorean Theorem
a 2 + 12 2 = 13 2 b = 12, c = 13 a 2 + 144 = 169 Simplify. a 2 = 25 Subtract. a = 5 Take the positive square root of each side. b. Find c. c3020ACB
a 2 + b 2 = c 2Pythagorean Theorem
20 2 + 30 2 = c 2 a = 20, b = 30400 + 900 = c
2Simplify.
1300 = c
2 Add. ⎷ ?? 1300 = c Take the positive square root of each side.36.1 ≈ c Use a calculator.
Find x.
1. x33 2. x 1593. x65 25 4.
x 5 9 4 9 5. x 3316
6. x 11
28Use a Pythagorean Triple to find x.
7. 8 17 x 8. 4524x
9. 28
96x
8-2Example
Exercises
? ABC is a right triangle. so a 2 + b 2 = c 2 1 31345≈ 36.7
663≈ 25.7
18 or 3
2 ≈ 4.2 12 60
15 51 100
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Compan ies, Inc.NAME DATE PERIOD
Chapter 8 12 Glencoe Geometry
ca b AC BStudy Guide and Intervention (continued)
The Pythagorean Theorem and Its Converse
Converse of the Pythagorean Theorem If the sum of the squares of the lengths of the two shorter sides of a triangle equals the square of the lengths of the longest side, then the triangle is a right triangle. You can also use the lengths of sides to classify a triangle. If a 2 + b 2 = c 2 , then if a 2 + b 2 = c 2 then ABC is a right triangle. ?ABC is a right triangle. if a 2 + b 2 > c 2 then ABC is acute. if a 2 + b 2 < c 2 then ABC is obtuse.Determine whether ?PQR is a right triangle.
a 2 + b 2 ? c 2Compare c
2 and a 2 + b 2 10 2 + (10 ⎷ ? 3 ) 2 ? 20 2 a = 10, b = 10 ⎷ ? 3 , c = 20100 + 300 ? 400 Simplify.
400 = 400? Add.
Since c
2 = and a 2 + b 2 , the triangle is a right triangle.Exercises
Determine whether each set of measures can be the measures of the sides of a triangle. If so, classify the triangle as acute , obtuse, or right. Justify your answer.1. 30, 40, 50 2. 20, 30, 40 3. 18, 24, 30
4. 6, 8, 9 5. 6, 12, 18 6. 10, 15, 20
7. ⎷ ? 5 , ⎷ ?? 12 , ⎷ ?? 13 8. 2, ⎷ ? 8 , ⎷ ?? 12 9. 9, 40, 41 201010⎷3
8-2Example
yes, right; yes, obtuse; yes, right; 502 = 30 2 + 40 2 40
2 > 20 2 + 30 2 30
2 = 24 2 + 18 2 yes, acute; no; 6 + 12 = 18 yes, obtuse; 9 2 < 6 2 + 8 2 20 2 > 10 2 + 15 2 yes, acute; yes, right; yes, right; 13 2 5 2 12 2 12 2 8 2 + 2 2 41
2 = 40 2 + 9 2quotesdbs_dbs5.pdfusesText_9
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