Question

A bicycle is drawn on a grid such that the front tire is represented by the equation (x-16)^2+y^2=9 what is the tire's diameter?

A. 6
B. 3
C. 9
D. 4

Answer 1

The equation of a circle is equal to:
(x – h)^2 + (y – k)^2 = r^2

where r is the radius
(x-16)^2 + y^2 = 3^2

So the radius is equal to 3.
We are asked to give the diameter.
Multiply the radius by 2.
Then the diameter is 3*2 = 6
The correct answer is letter A. 6