Posted by **Tareena-- check my answer please** on Saturday, May 24, 2008 at 4:39pm.

Two Planes leave an airport at the same time, one flying 300km/h and the other at 420km/h

The angle between their flight paths is 75 degrees after three hours, how fart apart are they?

- Math -
**drwls**, Saturday, May 24, 2008 at 5:12pm
I don't see your answer to check.

The law of cosines would work well on this problem. You know two sides (900 and 1260 km) and the included angle (75 deg) of a triangle.

- Math -
**Tareena-- check my answer please**, Saturday, May 24, 2008 at 5:29pm
so it would be c^2=a^2+b^2-2ab cos C

900^2+1260^2-2(900)(1260)(cos75)

c^2=33542.9

c=183.14km

is it right?

- Math -
**Tareena-- drwls check my answer please**, Saturday, May 24, 2008 at 5:33pm
thanks

- Math -
**drwls**, Sunday, May 25, 2008 at 1:08am
No. It isn't right. See my answer to your later post.

## Answer this Question

## Related Questions

- MATH - Two Planes leave an airport at the same time, one flying 300km/h and the ...
- Math - Two Planes leave an airport at the same time, one flying 300km/h and the ...
- Trig - Two planes leave an airport at the same time, one flying at 300 km/h and ...
- MATH - Two planes leave an airport at the same time, one flying east, the other ...
- MATH 112 - two planes leave an airport at the same time. Their speeds are 320 ...
- grade 7 math - Uniform Motion Related Problem Two planes leave an airport at 2 p...
- Math - an air traffic controller spots two planes at the same altitude flying ...
- Math - an air traffic controller spots two planes at the same altitude flying ...
- 11th grade-Math! - an air traffic controller spots two planes at the same ...
- math analysis - Two airplanes leave an airport at the same time. one travels in ...