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 =
= 6
diameter = 2 × r = 2 × 6 = 12
The area is what is given. Find the base and height and multiply that. Since, you done that, you simplify if any fraction is there. Then, you have an answer!
162 / 2 = 81
the answer is D
Answer:

Step-by-step explanation:
24 + 4y = 12y
- 4y - 4y
__________

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