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Sagot :

Answer:

C

Step-by-step explanation:

the measure of an inscribed angle is half the measure of its intercepted arc, so

arc DE = 2 × ∠ DFE = 2 × 18° = 36°

DF is a diameter of the circle , then

arc DEF = 180° , then

arc EF = 180° - 36° = 144°
  • mDFE=m DE/2
  • mDE=2(18)=36°

Now

mEF and m DE lies in one line hence supplementary

mEF:-

  • 180-36
  • 144°
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