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oh these are interesting
have u tried anything
i thoguht it wa 90.......
but now i think it is 45
u know that triangle there has a 91, so that angle has to be less than 89 at least
This page i linked before is a good help... http://www.regentsprep.org/Regents/math/geometry/GP15/CircleAngles.htm
very bottom one this time
so it is 90?
Without the measure of arc AD, you can;t solve this problem.
...well there are multiple choice so it is one of them
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?
lol yes i did . that is the exact question . i think the teacher messed up . but that is the question
Well, then, let's see if there are choices we can eliminate. |dw:1438788488246:dw|
Now let's look at the choices. Choice A. m
Choice B. m
so since it is less than 90 it has to be 45 right
Choice C. m
Choice C. m
so it is 45
The only solution that works is B. 45
thanks also what is cos(x) when it is -1
is it 360 or -360
The angle whose cosine is -1 is 180 or -180, and all coterminal angles.
oh so nothing it is not 360 or -360. ok thats all i needed to know
360 and -360 is the same as 0 degrees. There, the cosine is 1, not -1
ok thank you