Question

What is the measure of BDC ?

Answer 1

You'll need this one.

\(\dfrac{(Measure\;of\;Distant\;Arc) - (Measure\;of\;Closer\;Arc)}{2}\)

Burn it into your head.

Answer 2

42-15 / 2 @tkhunny like that

Answer 3

With parentheses. (42-15)/2

Answer 4

yes so know i subtract and then divide by 2

Answer 5

That's all there is to it.

There is a different rule if the desired angle is INSIDE the circle. You'll need that one, too.