Question

What is the diameter of the following?

Answer 1

Answer:

12

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

(x - 9)² + (y - 4)² = 36 ← is in standard form

with r² = 36 ⇒ r = $\sqrt{36}$ = 6

diameter = 2 × r = 2 × 6 = 12