Pre-Calc Exam Notes 19

Pre-Calc Exam Notes 19 - Applications and Solving Right...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Applications and Solving Right Triangles Section 1.3 19 θ r cos θ r sin θ r For some problems it may help to remember that when a right tri- angle has a hypotenuse of length r and an acute angle θ , as in the picture on the right, the adjacent side will have length r cos θ and the opposite side will have length r sin θ . You can think of those lengths as the horizontal and vertical “components” of the hypotenuse. Notice in the above right triangle that we were given two pieces of information: one of the acute angles and the length of the hypotenuse. From this we determined the lengths of the other two sides, and the other acute angle is just the complement of the known acute angle. In general, a triangle has six parts: three sides and three angles. Solving a triangle means ±nding the unknown parts based on the known parts. In the case of a right triangle, one part is always known: one of the angles is 90 . Example 1.19
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/21/2012 for the course MAC 1130 taught by Professor Dr.cheun during the Fall '11 term at FSU.

Ask a homework question - tutors are online