Question

What is the value of x in the circle below

Answer 1

x is the radius of the circle, right?

Answer 2

I think yes

Answer 3

Yes, it is.
Here is another radius.
All radii are congruent.

Answer 4

can you find the upper x?

Answer 5

hmm i want to say 18?

Answer 6

Notice we are dealing with a right triangle, and we can call upon our friend, Mr. Pythagoras, to help us.

Answer 7

16^2 + 4^2 = x

Answer 8

Use the Pythagorean theorem.
x is the radius of the circle and is the hypotenuse of the triangle.

Answer 9

Nice job at explaining @mathstudent55

Answer 10

@omgitsjc
Do you know how to use the Pythagorean theorem?

Answer 11

no not really