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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

- anonymous

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- schrodinger

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- dan815

oh these are interesting

- dan815

have u tried anything

- dan815

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## More answers

- anonymous

i thoguht it wa 90.......

- anonymous

but now i think it is 45

- dan815

|dw:1438749900936:dw|

- dan815

u know that triangle there has a 91, so that angle has to be less than 89 at least

- DanJS

This page i linked before is a good help...
http://www.regentsprep.org/Regents/math/geometry/GP15/CircleAngles.htm

- DanJS

very bottom one this time

- anonymous

so it is 90?

- mathstudent55

@HWBUSTER00
The problem states "given DA", but the measure of arc DA is not there. What is it?

- mathstudent55

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- mathstudent55

Without the measure of arc AD, you can;t solve this problem.

- anonymous

...well there are multiple choice so it is one of them

- 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

lol yes i did . that is the exact question . i think the teacher messed up . but that is the question

- mathstudent55

Well, then, let's see if there are choices we can eliminate.
|dw:1438788488246:dw|

- mathstudent55

|dw:1438788576392:dw|

- mathstudent55

Now let's look at the choices.
Choice A.
m

**
**

- mathstudent55

Choice B.
m

**
**

- anonymous

so since it is less than 90 it has to be 45 right

- mathstudent55

Choice C.
m

**
**

- mathstudent55

Choice C.
m

**
**

- anonymous

so it is 45

- mathstudent55

The only solution that works is B. 45

- mathstudent55

yes

- anonymous

thanks also what is cos(x) when it is -1

- anonymous

is it 360 or -360

- mathstudent55

|dw:1438789256863:dw|

- mathstudent55

The angle whose cosine is -1 is 180 or -180, and all coterminal angles.

- anonymous

oh so nothing it is not 360 or -360. ok thats all i needed to know

- mathstudent55

360 and -360 is the same as 0 degrees.
There, the cosine is 1, not -1

- anonymous

ok thank you

- mathstudent55

You're welcome.

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