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jksimmons2364
05.10.2019 •
Mathematics
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find the radian measure of an angle of -280 degrees.
find the degree measure of an angle of 3pi/5 radians.
find the exact values of cos(3pi/4 radians) and sin(3pi/4 radians).
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Ответ:
- 14π/9; 108°; -√2/2; √2/2
Step-by-step explanation:
To convert from degrees to radians, use the unit multiplier![\frac{\pi }{180}](/tpl/images/0288/4678/2ff6d.png)
In equation form that will look like this:
- 280° ×![\frac{\pi }{180}](/tpl/images/0288/4678/2ff6d.png)
Cross canceling out the degrees gives you only radians left, and simplifying the fraction to its simplest form we have![-\frac{14\pi }{9}](/tpl/images/0288/4678/47ca6.png)
The second question uses the same unit multiplier, but this time the degrees are in the numerator since we want to cancel out the radians. That equation looks like this:
Simplifying all of that and canceling out the radians gives you 108°.
The third one requires the reference angle of
.
If you use the same method as above, we find that that angle in degrees is 135°. That angle is in QII and has a reference angle of 45 degrees. The Pythagorean triple for a 45-45-90 is (1, 1, √2). But the first "1" there is negative because x is negative in QII. So the cosine of this angle, side adjacent over hypotenuse, is![-\frac{1}{\sqrt{2} }](/tpl/images/0288/4678/61cd6.png)
which rationalizes to![-\frac{\sqrt{2} }{2}](/tpl/images/0288/4678/1363f.png)
The sin of that angle is the side opposite the reference angle, 1, over the hypotenuse of the square root of 2 is, rationalized,![\frac{\sqrt{2} }{2}](/tpl/images/0288/4678/8b1f8.png)
And you're done!!!
Ответ:
there are many angles what angles are you talking about
Step-by-step explanation: