Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises: 22


r is the hypotenuse of a right triangle formed by (x,y)

Work Step by Step

1. The distance formula $r=\sqrt {x^{2}+y^{2}}$. This looks a lot like Pythagorean theorem. If you think about it as Pythagorea theorem, you will see that r is length of hypotenuse of a triangle with legs x and y.
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