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Travka [436]
3 years ago
6

If the measure of DEF is 65 what is the measure of DE. PLEASE HELP FAST

Mathematics
2 answers:
Wittaler [7]3 years ago
8 0

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




kotykmax [81]3 years ago
6 0

Answer:

130

Step-by-step explanation:

For Apex

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