Question

Find the measure of arc EC.
50°
70°
100°
140°

Answer 1

Here's the formula

Answer 2

Applying it to your question, that means

7x equals half of (5x + 90)

can you solve for x?

Also, I took that screenshot from
https://mathbitsnotebook.com/Geometry/Circles/CRAngles.html

It's a wonderful website :)

Answer 3

Once you solve for x, remember that the question is asking for the measure of arc EC

so 5 * x is your final answer

Answer 4

Ok thank you!

Answer 5

Let me know if you didn't understand something! I can also check your answer for you :)