Question

If the measure of DEF is 65, what is the measure of ?
http://media.apexlearning.com/Images/200701/18/df4742e6-e568-423e-bfe0-61f1985506e7.gif

A. 65
B. 115
C. 32.5
D. 130

Answer 1

what is the measure of ?? whaT?

Answer 2

i guess measure of blue part right ?

Answer 3

is 32.5 for 130

Answer 4

DEF is an angle that formed by tangent and chord which is half of the measure of arc DE
to find DE
\[\huge\rm m<DEF=\frac{ 1 }{ }mDE\]
m<DEF=65
solve for mDE