Asked
11 months ago

Viewed
290584 times

Is that the radius or diameter?

A= pi r ^2

A= pi r ^2

**Answer:**

**If r = 18, the area of the circle is 1017.88**

**If d = 18, the area of the circle is 254.47**

**Step-by-step explanation:**

Because your question was a little vague I had to give two answers. You need to specify what 18 is; is it the radius or the diameter?

Since the equation for finding the area of a circle is A = 2 * π * r, and half of the diameter of a circle is equal to the radius, the answers will be quite different.

**If radius:**

r = 18

A = 2 * π * (18)

A = 1017.88

**If diameter:**

d=18

1/2 * 18 = 9

A = 2 * π * (9)

A = 254.47

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