If the measure of arc def is 248°, what is the measure of ∡def?

the complete question in the attached figure
we know that
 angle < DEF is an inscribed angle. 
An inscribed angle is an angle with its vertex on the circle which is formed by two intersecting chords. 
The inscribed angle measures half of the arc it comprises
the arc it comprises is the arc DCF
 the arc DCF is equal to



Hence
∡DEF is equal to  arc DCF/2


the answer is
∡DEF=°

-64

Step-by-step explanation:

When you multiply (-4) and (-4), it's 16

To that 16, you multiply (-4), so it's -64.

This is also the same as (-4)^3!