Question

question 8 of 10

the equation for the circle below is \\(x^2 + y^2 = 121\\). what is the length of the circles radius?

a. 60.5
b. 11
c. 121
d. 5.5

Explanation:

Identify the standard equation of a circle

$$ x^2 + y^2 = r^2 $$

Relate the given equation to the standard form

$$ r^2 = 121 $$

Solve for the radius

$$ r = \sqrt{121} = 11 $$

Answer:

• A. 60.5
• B. 11 (Correct answer)
• C. 121
• D. 5.5