Posted by John on Saturday, April 16, 2011 at 5:39pm.
Peter (P) and Jamie(J) have computer factories that are 132 miles apart. They both ship their completed parts to Diane (D). Diane is 72 miles from Peter and 84 miles from Jamie. Using the points D,J,and P to form a triangle, find m<PDJ to the nearest tenth of a degree.

trig  MathMate, Saturday, April 16, 2011 at 7:12pm
Given ΔPDJ,
PJ=132 miles
PD=72 miles
DJ=84 miles
Triangle (angles) can be solved using the cosine rule, since all sides are known.
Let ∠PDJ = θ
Then
cos(θ) = (PD^sup2;+DJ²PJ²)/(2PD*DJ)
Can you take it from here?

trig  maria, Sunday, May 4, 2014 at 1:09am
115.4
Answer This Question
Related Questions
 math  Charlie and Peter are driving around a racetrack. Charlie drives at an ...
 8th grade math  Ms. Sue please  Charlie and Peter are driving around a ...
 Math  8th grade  Please help  I don't know the formula to figure this out. ...
 math  Peter & Diane have the same average in mathematics. On the next test ...
 Math (Trig)  A ship leaves port at noon and has a bearing of S 25° W. The ship ...
 Maths calculus  Two ships leave different ports A and B 100 miles apart at ...
 Math  Stephanie runs 5 days a week. Her distances for 5 days are 2.8 miles, 3....
 math***help plz***  please help me with math. A car travels 132 miles using 4 ...
 trig  A freighter leaves on a course of 120 degrees and travels 515 miles. The ...
 Math  A boat travels 74 miles on a course with direction 34 degrees and then ...
More Related Questions