Question

Find the area of a circle with diameter, d = 18m.Give your answer in terms of π.​

Answer 1

Answer:

81π

Step-by-step explanation:

Area of a circle formula is : $A=\pi r^2$. r stands for radius.

Radius is half of the diameter. To solve for the area of the circle, we must replace r with diameter/2 which is 9 (18/2 = 9).

$A=\pi 9^{2}$

Now, the question wants us to give the answer in terms of pi. So we are going to simplify the equation WITH PI. Meaning, we aren't going to multiply pi. So we will just simplify 9 squared to 81.

So in terms of pi the area is 81π

Answer 2

Answer:

81π

Step-by-step explanation:

Area of a circle= π$r^{2}$ ( where r is the radius multiplying it twice)

Area of a circle = π × r × r ( this is the formula in simplier terms )

Area of a circle = 3.14 × 9 × 9 ( To get 9 divide 18 by 2 as diameter is 2 radii

Area of a circle = 81π ( multiply the numbers AND THESE ARE THE TWO NINES LEAVING π)

HOPE IT HELPED