Question

The area of a circle is found using the formula A=nr^2 , where r is the radius. if the area of a circle is 36n square feet, what is the radius, in feet?

N= Pi

Answer 1

$$
Area = \pi r^2\\
36\pi = \pi r^2\\
\text{solve for "r"}\\
\cfrac{36\pi}{\pi} = r^2
$$

Answer 2

A = pi *r^2 just fill in what they gave you

36pi = pi r^2 just need to solve for r,
-- ---
pi pi

36 = r^2

Answer 3

what is the sq rt of 36?

Answer 4

so, to isolate "r", get \(\large \sqrt{}\) on both sides, what do you get?

Answer 5

sq rt of 36 is 6?

Answer 6

so, r = 6

Answer 7

right that is the radis

Answer 8

6n or just 6?

Answer 9

errrr 6 ft

Answer 10

in the answer choice there is 6n (pi) and just 6 ? which is it..

Answer 11

6 units, whatever units, meters, feet, who knows, \(\pi\) for this case, is just a CONSTANT used, \(\pi = 3.1416\)

Answer 12

soooo which one do i use

Answer 13

it is just 6 ft

Answer 14

okat thanks both of yall so much :)) can you help me with my next question?

Answer 15

from
$$
Area = \pi r^2\\
36\pi = \pi r^2\\
\text{solve for "r"}\\
\cfrac{36\pi}{\pi} = r^2
$$

Answer 16

36(3.14) = 3.14(6^2) check it
113.04 = 113.04

Answer 17

notice, the \(\pi\) above and below, will cancel out, so, as Jim766 said, you're only left with "36" all by its lonesome

Answer 18

yes