+0  
 
-1
163
5
avatar+3654 

Help 41,42

NotSoSmart  May 17, 2018
 #1
avatar+3276 
+2

41. cos 300=1/2

smileysmiley

tertre  May 17, 2018
 #2
avatar+3654 
0

42. ?

NotSoSmart  May 17, 2018
 #3
avatar+963 
+3

41. Here is the solution:

 

Imagine the unit circle: 

 

 

We know that 300 degrees is in the fourth quadrant, where cosine is positive.

300 degrees has a reference angle of 60 degrees, since it is 60 degrees away from the x-axis

 

Since \(\cos{60º}=\frac12, \cos{300º}=\frac12\)

 

I hope this helped,

 

Gavin

GYanggg  May 17, 2018
 #4
avatar+963 
+3

42. Assuming s is the major arc, here is the solution:

 

π here is 180 degrees, so 5π/3 is also 5 * 180 / 3 = 300

 

That angle is 300 degrees. 

 

The circumference is 2r * π, where r is the radius and π is 3.1415...

 

The circumference is 18π. 

 

Since the major arc is 300/360 or 5/6 of the circumference, it is 

 

5/6 * 18π = 15π long. 

 

This in decimal is 15 • 3.141...=47.124...

 

A. 

 

I hope this helped,

 

Gavin

GYanggg  May 17, 2018
 #5
avatar+3654 
+1

Thanks!

NotSoSmart  May 17, 2018

14 Online Users

avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.