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#1 2014-09-15 14:14:59

harrychess
Member
Registered: 2014-04-04
Posts: 33

Angles In Circles

Triangle ABC is inscribed in the circle and AC = AB. The measure of angle BAC is 42 degrees and segment ED is tangent to the circle at point C. What is the measure of angle ACD? I know the formulas, but I don't know how to get angle ACD. Can someone help me?

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#2 2014-09-15 20:07:27

Bob
Administrator
Registered: 2010-06-20
Posts: 10,058

Re: Angles In Circles

hi harrychess,

The formula you need is here:

http://www.mathisfunforum.com/viewtopic.php?id=17799

post #7

That makes angle ACD = angle ABC

[note: The wording doesn't say which way round to put D and E.  I've put D closer to A and E closer to B, on my diagram.)

Bob


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob smile

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