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Karolina [17]
3 years ago
11

someone please please help me!

Mathematics
1 answer:
borishaifa [10]3 years ago
4 0

Answer:

mDE=90°

Step-by-step explanation:

In this problem, one is asked to find the measure of the arc in degrees. This problem provides one with a diagram since the center is unnamed, call the center point (O). One is given the information that angle (<DOE) has a measure of (90) degrees. One is asked to find the degree measure of the surrounding arc (DE).

The central angles theorem states that if an angle has its vertex on the center of a circle, the degree measure of the angle is equal to the degree measure of the surrounding arc. One can apply this here by stating the following:

m

Substitute,

90=mDE

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