EF is tangent to the circle we'll assume; otherwise there's no progress.
Call the center C. ECD is isosceles, formed from two radii and the chord.
Angle CED is complementary to DEF
CED = 90 - 65 = 25 degrees
CDE is congruent, isosceles triangle and all that: CDE=25
That leaves DCE=180-25-25=130 degrees
That's the measure of arc DE as well:
Answer: 130 degrees, choice A
x+3
4+(x+2)
4
or
x+3 * 1
x+6 4
x+3
4x+24
R = ((3V)/((pi)(h^2))+h)/3
Did you just state the answer? Because it seems like you just answered the question for us.
