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Mathematics 21 Online
OpenStudy (anonymous):

Could someone please help me with how to solve this problem. No answers or you'll be reported! Medal will be rewarded for help though ^.^

OpenStudy (anonymous):

OpenStudy (anonymous):

I'd start by drawing a radius to R (from the center). You know the central angle that is formed. This should lead you to the answer.

OpenStudy (debbieg):

I just wanted to say that I think it's AWESOME how you posted this question. Such a refreshing change! :)

OpenStudy (anonymous):

Okay so I got 90˚ for part of the triangle but I still can't get the other parts?

OpenStudy (anonymous):

and your welcome ^.^

OpenStudy (anonymous):

You are given the length of the arc. Remember the relationship of the central angle to the subtended arc length?

OpenStudy (anonymous):

no.... -.-

OpenStudy (anonymous):

:) They are equal!

OpenStudy (anonymous):

I though that was it but I but my brain always second guesses it's self :O!!! Thank you

OpenStudy (anonymous):

Okay so then because of the angle being 107˚ then the other angle would be 73˚?

OpenStudy (anonymous):

Yes, that's right! And you know one more angle already...

OpenStudy (anonymous):

which is 90˚??? So 180-73-90=17...but that's not one of the answers

OpenStudy (anonymous):

Eeek! Sorry, I made a bad assumption :( I was thinking the base went through the center. OK...you can find the measure of arc RT. You have ANOTHER relationship between an inscribed angle and an arc.

OpenStudy (anonymous):

uhhhhhhh.............oh my gosh I'm clueless :\

OpenStudy (anonymous):

The angle is 1/2 the measure of the arc.

OpenStudy (anonymous):

Okay so then arc RT would equal 73, then would you divide that by two to get 36.5˚?

OpenStudy (anonymous):

RT isn't 73 :) That's the mistake I made. You already know angle S, work backwards.

OpenStudy (anonymous):

Oh my goodness, I keep on trying to do this but it's so confusing! ^///^

OpenStudy (anonymous):

If angle S is 25 degrees, what it RT?

OpenStudy (anonymous):

50?

OpenStudy (anonymous):

Yep

OpenStudy (anonymous):

Okay so where do I work from that (my book didn't teach me any of this)

OpenStudy (anonymous):

Almost there! You have an equation about an angle formed by a tangent and a secant...is that in your book?

OpenStudy (anonymous):

no but I just found a website if anyone else has any problems ---> http://www.mathwarehouse.com/geometry/circle/tangents-secants-arcs-angles.php

OpenStudy (anonymous):

:) You want the first equation

OpenStudy (anonymous):

okay so 107-50=57/2=28.5?

OpenStudy (anonymous):

Yes!

OpenStudy (anonymous):

OMG THANK YOU SO MUCH I"M FANNING YOU!!!!

OpenStudy (anonymous):

:) No problem, good luck!

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