anonymous
  • anonymous
Fan & Medal to most helped Calculate EBA , given DA and m EFA =178º. The figure is not drawn to scale 90° 45° 133° 266° http://static.k12.com/eli/bb/817/-1/0/2_36869_44974/-1/5c45df68fdad740c9f94d22ea5f92dd60c7a03f7/media/ccdbc5a3efc5b98917c43109efe2d5434ef545be/mediaasset_651869_1.jpg
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
dan815
  • dan815
oh these are interesting
dan815
  • dan815
have u tried anything
dan815
  • dan815
|dw:1438749327954:dw|

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anonymous
  • anonymous
i thoguht it wa 90.......
anonymous
  • anonymous
but now i think it is 45
dan815
  • dan815
|dw:1438749900936:dw|
dan815
  • dan815
u know that triangle there has a 91, so that angle has to be less than 89 at least
DanJS
  • DanJS
This page i linked before is a good help... http://www.regentsprep.org/Regents/math/geometry/GP15/CircleAngles.htm
DanJS
  • DanJS
very bottom one this time
anonymous
  • anonymous
so it is 90?
mathstudent55
  • mathstudent55
@HWBUSTER00 The problem states "given DA", but the measure of arc DA is not there. What is it?
mathstudent55
  • mathstudent55
|dw:1438787940138:dw|
mathstudent55
  • mathstudent55
Without the measure of arc AD, you can;t solve this problem.
anonymous
  • anonymous
...well there are multiple choice so it is one of them
mathstudent55
  • mathstudent55
Why does the problem state "given DA" when DA is not given above? Did you copy all the information from the problem into your post?
anonymous
  • anonymous
lol yes i did . that is the exact question . i think the teacher messed up . but that is the question
mathstudent55
  • mathstudent55
Well, then, let's see if there are choices we can eliminate. |dw:1438788488246:dw|
mathstudent55
  • mathstudent55
|dw:1438788576392:dw|
mathstudent55
  • mathstudent55
Now let's look at the choices. Choice A. m
mathstudent55
  • mathstudent55
Choice B. m
anonymous
  • anonymous
so since it is less than 90 it has to be 45 right
mathstudent55
  • mathstudent55
Choice C. m
mathstudent55
  • mathstudent55
Choice C. m
anonymous
  • anonymous
so it is 45
mathstudent55
  • mathstudent55
The only solution that works is B. 45
mathstudent55
  • mathstudent55
yes
anonymous
  • anonymous
thanks also what is cos(x) when it is -1
anonymous
  • anonymous
is it 360 or -360
mathstudent55
  • mathstudent55
|dw:1438789256863:dw|
mathstudent55
  • mathstudent55
The angle whose cosine is -1 is 180 or -180, and all coterminal angles.
anonymous
  • anonymous
oh so nothing it is not 360 or -360. ok thats all i needed to know
mathstudent55
  • mathstudent55
360 and -360 is the same as 0 degrees. There, the cosine is 1, not -1
anonymous
  • anonymous
ok thank you
mathstudent55
  • mathstudent55
You're welcome.

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