Thursday

April 17, 2014

April 17, 2014

Posted by **Rachal** on Saturday, May 14, 2011 at 8:21am.

I'm coming up with 504 degrees, but I think I'm missing a step.

- Trig- Check my answer Please -
**Rachal**, Saturday, May 14, 2011 at 8:23amI now think its 36 degrees

- Trig- Check my answer Please -
**Anonymous**, Saturday, May 14, 2011 at 8:39amVisually it doesn't make sense for an angle to be negative.

However we often measure angles off of some axis, such as the x-axis, and positive angles go around counter-clockwise, while negative angles go around clockwise.

Outside of the context of a Cartesian Coordinate system (x-y plane), negative angles don't generally make sense but:

-144°=360°-144°=216°

Trigonometric Identities for negative angles:

sin(-A) = - sin(A)

cos(-A) = cos(A)

tan(-A) = - tan(A)

cot(-A) = - cot(A)

csc(-A) = - csc(A)

sec(-A) = sec(A)

**Related Questions**

math - in a pentagon each of the two angles measuer 76 degrees another angle ...

SCIENCE - Seawater of average salinity freezes at about: a. 32 degrees F b. 0 ...

trig - Find the reference angle for each given angle: a) 325 degrees b) 14pi/3 c...

math - Snell's law of refraction can be written as sin i = n sin r, where n is ...

Math - 3) From two tracking stations A and B, 350 km apart, a UFO is sighted at ...

trig - If a=8, the angle C=50 degrees and the angle A=35 degrees find the other ...

Math: Applications of Dot Product - 15) In Question 14, if the ramp makes an ...

MATH PLEASE - can a reference angle be negative? Tye "reference angle" in google...

math - find the angle that is coterminal to 525 degrees and lies between 0 ...

Trigonometry - use the appropriate trig identity (sum and difference, half angle...