Circle X is shown in the diagram. (check picture)
Which equation can be used to solve for m21?
A.) m<1=1/2(a - b)
B.) m<1 = 1/2 (a + b)
C.) m<1 = 1/2 (c-d)
D.) m<1 = 1/2(c+ d)
![Circle X is shown in the diagram check picture Which equation can be used to solve for m21 A mlt112a b B mlt1 12 a b C mlt1 12 cd D mlt1 12c d class=](https://us-static.z-dn.net/files/dc9/7a9c9b586e7579c01a7e3689a6965152.png)