Given: AV and BD are diameters
If chord CD is drawn, the measure of ∠ACD would be
39, 78, or102

https://media.glynlyon.com/g_geo_2012/7/group124.gif

Question

Given: AV and BD are diameters
If chord CD is drawn, the measure of ∠ACD would be
39, 78, or102

https://media.glynlyon.com/g_geo_2012/7/group124.gif

imstuck · Answer

First of all you said, "Given: AV and BD are diameters".  I'm guessing that AV is supposed to be AC?

mven · Answer

yes it is sorry

imstuck · Answer

When you draw chord CD, the angle you are investigating now is an inscribed angle.  The rule for that is this:    The measure of an inscribed angle is half the measure of its intercepted arc.

imstuck · Answer

If arc AD is 78, then its inscribed angle, ACD is...

mven · Answer

39?

imstuck · Answer

Yep!

mven · Answer

Ohhhh that makes sense thanks. and thanks for not just giving me the answer most people dont walk through it first.

imstuck · Answer

Remember that rule and you will do just fine with these!

mven · Answer

already written down thanks