Saturday

December 20, 2014

December 20, 2014

Posted by **John** on Saturday, April 16, 2011 at 5:39pm.

- trig -
**MathMate**, Saturday, April 16, 2011 at 7:12pmGiven 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;+DJ²-PJ²)/(2PD*DJ)

Can you take it from here?

- trig -
**maria**, Sunday, May 4, 2014 at 1:09am115.4

**Answer this Question**

**Related Questions**

math - Peter & Diane have the same average in mathematics. On the next test ...

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 bought a computer that cost 1,500. The computer is on sale for 15% ...

Physics - Diane rows a boat at 8.3 m/s directly across a river that flows at 5.6...

math - Diane's Pottery Shop orders china from a supplier for $240 including $30 ...

3rd grade math - peter's mother picked him up at jill's house after they ate. ...

Maths- calculus - Two ships leave different ports A and B 100 miles apart at ...

math - Paul an Peter each toss a coin and record the results. Paul: H H T H T H ...