Determine the measure of ∠DFB.

Mathematics

1 answer:

leva [86]3 years ago

4 0

Answer:

Step-by-step explanation:

The arc defining one part of the circle + the arc vertically opposite the given arc when added must be divided by 2. That's the value of angle at the intersection.

In this case, (arc BD + arcEC)/2 = < EFC

Arc bd = 69

Arc CE = 67

<EFC = (69 + 67)/2 = 68

So the answer is number 4

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