Friday
April 18, 2014

Homework Help: Trigonometry

Posted by Laurianne on Tuesday, January 19, 2010 at 6:25pm.

Am I doing something wrong? I have to use the Law of Consines with the following numbers: a=30, b=15, c=17. I tried to find the angle a, since a is the longest side. Cos A=(15^2+17^2-30^2)/(2x17x15)=-.7568 The inverse being 139 degrees. But when I multiply 15, the measure of b by sin 139/30, I get .32 or 18.66. This is 157. 180-157=23 But when I multiply 17 by sine139/30 I get 21. Does this mean there are two triangles, or that I did it wrong?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

trigonometry (repost) Mathmate - I want to start by saying thank you . You have ...
Trigonometry - Find all the solutions of the following triangle using the Law of...
Trigonometric functions - Find the value of Sec A. and I have a right triangle ...
science-physics - You walk 15 m south and 35 m east. Find the magnitude and ...
trigonometry - in triangle abc, angle c is a right angle, AC=8,Bc=15 and AB=17 a...
Summer School Calculus - Add the following vectors , 7m/s [N30E] and 2m/s [S17E...
math, algebra - Can someone check this for me : Find the gcf for each of hte ...
chem - hi can anyone help how do i determine the molecular formular of the oxide...
trigonometry - Use logarithms and the law of tangents to solve the triangle ABC...
Physics (maybe it's just math) - A sphere of copper is subjected to 89.7 MPa of ...

Search
Members