Pythagorean Theorem (6.1) theorem (6.1) postulate (6.1) proof (6.1) Determine the unknown side length of the triangle.
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1 Chapter 6 Summary Key Terms right triangle (6.1) right angle (6.1) leg (6.1) hypotenuse (6.1) diagonal of a square (6.1) Pythagorean Theorem (6.1) theorem (6.1) postulate (6.1) proof (6.1) converse (6.2) Converse of the Pythagorean Theorem (6.2) Pythagorean triple (6.2) Applying the Pythagorean Theorem A right triangle is a triangle with a right angle. A right angle is an angle with a measure of 90 and is indicated by a square drawn at the corner formed by the angle. A leg of a right triangle is either of the two shorter sides. Together, the two legs form the right angle of a right triangle. The hypotenuse of a right triangle is the longest side and is opposite the right angle. The Pythagorean Theorem states that if a and b are the lengths of the legs of a right triangle and c is the length of the hypotenuse, then. Determine the unknown side length of the triangle c c c c c 8.9 The unknown side length of the triangle is about 8.9 units. 4 C 8 Chapter 6 Summary 377
2 Applying the Converse of the Pythagorean Theorem The Converse of the Pythagorean Theorem states that if a, b, and c are the side lengths of a triangle and, then the triangle is a right triangle. Determine whether a triangle with side lengths 5, 9, and 10 is a right triangle fi 100 A triangle with side lengths 5, 9, and 10 is not a right triangle because fi Applying the Pythagorean Theorem to Solve Real-World Problems The Pythagorean Theorem can be used to solve a variety of real-world problems which can be represented by right triangles. An escalator in a department store carries customers from the first floor to the second floor. Determine the distance between the two floors. 36 feet b b b b b < The distance between the two floors is feet. 30 feet 378 Chapter 6 Pythagorean Theorem
3 Determining the Distance Between Two Points in a Coordinate System The distance between two points, which do not lie on the same horizontal or vertical line, on a coordinate plane can be determined using the Pythagorean Theorem. Determine the distance between points (25, 3) and (7, 22). y x A line segment is drawn between the two points to represent the hypotenuse of a right triangle. Two line segments are drawn (one horizontal and one vertical) to represent the legs of the right triangle. The lengths of the legs are 5 units and 12 units c c 2 c _ 169 c 5 13 The distance between (25, 3) and (7, 22) is 13 units. Chapter 6 Summary 379
4 Determining the Lengths of Diagonals Using the Pythagorean Theorem The Pythagorean Theorem can be a useful tool for determining the length of a diagonal in a two-dimensional figure. Determine the area of the shaded region. 7 in. 7 in. The area of the square is: A 5 s 2 A A 5 49 square inches The diagonal of the square is the same length as the diameter of the circle. The diagonal of the square can be determined using the Pythagorean Theorem c c 2 c c < 9.90 inches So, the radius of the circle is 1 (9.90) inches 2 The area of the circle is: A 5 pr 2 A 5 (3.14)(4.95) 2 A < square inches The area of the shaded region is < square inches. 380 Chapter 6 Pythagorean Theorem
5 Determining the Lengths of Diagonals in Three-Dimensional Solids The Pythagorean Theorem can be used to determine the length of a diagonal in a geometric solid. An alternate formula derived from the Pythagorean Theorem can also be used to determine the length of a diagonal in a geometric solid. In a right rectangular prism with length <, width w, height h, and diagonal length d, d 2 5 < 2 1 w 2 1 h 2. Determine the length of a diagonal in a right rectangular prism with a length of 4 feet, a width of 3 feet, and a height of 2 feet. 2 ft 3 ft 4 ft The diagonal is the hypotenuse of a triangle with one leg being the front left edge of the prism and the other leg being the diagonal of the bottom face. The length of the diagonal of the bottom face is: c c 2 c c 5 5 feet The length of the prism s diagonal is: c c 2 c c < 5.39 feet Using the alternate formula, the length of the prism s diagonal is: d 2 5 < 2 1 w 2 1 h 2 d d d d 5 29 d < 5.39 feet Chapter 6 Summary 381
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