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Published byCharlotte Stewart Modified over 4 years ago

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Applying the Pythagorean Theorem Adapted from Walch Education

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Key Concepts Reviewing Distance on a Number Line To find the distance between two points, a and b, on a number line, find the absolute value of the difference of a and b. This can be expressed algebraically as |a – b| or |b – a|. For example, to find the distance between –4 and 5, take the absolute value of the difference of –4 and 5. |–4 – 5| = |–9| = 9 or |5 – –4| = |5 + 4| = |9| = 9 The distance between the numbers –4 and 5 is 9 units.

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Reviewing the Pythagorean Theorem Right triangles are triangles with one right (90˚) angle. The side that is the longest and is always across from the right angle is called the hypotenuse. The two shorter sides are referred to as the legs of the right triangle. We can use the Pythagorean Theorem to calculate the length of any one of the three sides.

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To find the distance between two points on a coordinate system, we can use the Pythagorean Theorem. Finding the Distance Between Two Points Using the Pythagorean Theorem 1.Plot the points on a coordinate system. 2.Draw lines to form a right triangle, using each point as the end of the hypotenuse. 3.Calculate the length of the vertical side, a, of the right triangle by taking the absolute value of the difference of the y-values ( |y 2 – y 1 | ). 4.Calculate the length of the horizontal side, b, of the right triangle by taking the absolute value of the difference of the x- values ( |x 2 – x 1 | ). 5.Use the Pythagorean Theorem to calculate the length of the hypotenuse, c.

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Practice # 1 Tyler and Arsha have mapped out locations for a game of manhunt. Tyler’s position is represented by the point (–2, 1). Arsha’s position is represented by the point (–7, 9). Each unit is equivalent to 100 feet. What is the approximate distance between Tyler and Arsha?

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Calculate the length of the vertical side, a, of the right triangle. |y 2 – y 1 | = |9 – 1| = |8| = 8 Calculate the length of the horizontal side, b, of the right triangle. |x 2 – x 1 | = |–7 – –2| = |–5| = 5

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Use the Pythagorean Theorem to calculate the length of the hypotenuse, c. a 2 b 2 = c 2 Pythagorean Theorem 8 2 + 5 2 = c 2 Substitute values for a and b. 64 + 25 = c 2 Simplify each term. 89 = c 2 Simplify. Take the square root of both sides of the equation. The distance between Tyler and Arsha is approximately 9.4 units or 940 feet.

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Practice # 2 Kevin is standing 2 miles due north of the school. James is standing 4 miles due west of the school. What is the distance between Kevin and James?

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Thanks for Watching!!!! ~ Ms. Dambreville

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