Friday

March 6, 2015

March 6, 2015

Posted by **Anonymous** on Thursday, April 18, 2013 at 8:04pm.

a=4.2 cm b= 5.7 cm measure angle A= 39 degrees

2. What angle in the first quadrant could you reference to help you find the sine and cosine of each of the following angles?

a. 330 degrees

b. 120 degrees

c. 113 degrees

d. 203 degrees

3. Solve for x.

(3/x+1)+4/x=2

**I need help especially on this.4. Sketch a unit circle. In your circle, sketch in an angle that has:

a. A positive cosine and a negative sine.

b. A sine of -1.

c. A negative cosine and a negative sine.

d. A cosine of about -0.9 and a sine of about 0.4.

e. Could an angle have a sine equal to 0.9 and cosine equal to 0.8? Give an example angle or explain why not?

- Algebra2--- -
**Reiny**, Thursday, April 18, 2013 at 9:08pm1.

I made a sketch and we have

sinB/5.7 = sin39°/4.2

sinB = .854

so B = 58.66° or B =121.34°

So we have the ambiguous case

if B = 58.66° , then C = 82.34°

find c using the sine law with those values

if B = 121.34° , then C = 19.66°

find c using the sine law

Two different triangles would be possible

2.

330° ----> 360-330 = 30°

120°-----> 180-120 = 60

113 =----> 180 - 113 = 67

etc

3. Did you mean

3/(x+1) or 3/x + 1 the way you typed it, ---< big difference!!!

4.

Unfortunately we cannot show graphs on this forum.

Here is a clip that has an interesting way to memorize the different situations.

http://www.youtube.com/watch?v=ao4EJzNWmK8

**Answer this Question**

**Related Questions**

Algebra 2 .. - 1. An artist is designing triangular mirrors. Determine the ...

Algebra 2.... - 1. An artist is designing triangular mirrors. Determine the ...

math - how can you estimate heights and distances you can't easily measure with ...

math - how can you estimate heights and distances you can't easily measure with ...

Pre-Calculus - Determine the number of triangles that can be formed with the ...

algebra - Jeff made some designs using equilateral triangles, as shown bellow. ...

math - how can you estimate heights and distances you can't easily measure with ...

calculus - The base of a solid is a circle of radius = 4 Find the exact volume ...

maths - Alan is using matchsticks to make isosceles triangles. Isosceles ...

math - Assume that the sides of triangles are limited to whole-number measures. ...