Question

Find the diameter of a circle whose equation is x2+(y−2)2=100x2+(y−2)2=100.

400

20

10

100

Answer 1

In this question r^2 = 100

Take the square root of 100
sqrt(r^2) = sqrt(100)
r = 10

But you want the diameter.
d = 2 * r
d = 20

B answer.