anonymous
  • anonymous
In ABC, C is a right angle, what is the measure of x?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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tkhunny
  • tkhunny
A cosine function would help you with that. Are you equipped to utilize such a function?
anonymous
  • anonymous
I have a calc

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tkhunny
  • tkhunny
Great. Make sure it is in degree mode and find the inverse cosine of 8/21.
anonymous
  • anonymous
do I use the cos^-1?
tkhunny
  • tkhunny
That's right. If you get 1.18, or close to it, your calculator is in Radian Mode and you will need to figure out how to change it to Degree mode.
anonymous
  • anonymous
is it 30
tkhunny
  • tkhunny
Is what 30? What are the units with that? Did you divide 8/21? What did you get? Exactly what keys did you press to get that result?
anonymous
  • anonymous
Im sorry Im looking at the wrong question....67.6
tkhunny
  • tkhunny
If you hold down the [alt] key, and while holding it down, press on the numeric keypad 0 1 8 6, you can achieve he degree symbol. 67.6º
anonymous
  • anonymous
That doesnt work on my laptop
tkhunny
  • tkhunny
Fair enough. You do need a separate numeric keypad. Anyway, good work. You find 67.6º using the inverse cosine function. Do you understand why we used that button? You should be familiar with the right triangle definition of sine, cosine, and tangent.
anonymous
  • anonymous
Im just startin to get the hang of it
tkhunny
  • tkhunny
Well, given an acute angle (call it \(\alpha\)) of a right triangle, we have \(\cos(\alpha) = \dfrac{Adjacent\;Leg}{Hypotenuse}\). This is why I suggested the cosine function and 8/21. You will be expected to know this definition and usage. Good work. Keep plugging away. You'll get it.
anonymous
  • anonymous
thanks

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