Question

i need help with area of a circle

A circular plate has a diameter of 6 inches.

What is the exact area of the plate?



A.3π square inches


B.6π square inches


C.36π square inches


D.9π square inches

Answer 1

What's the formula for area of a circle?

Answer 2

i don't know that is y i need help

Answer 3

Alright so, Area of a circle = pir^2

Answer 4

\[A=\pi r^2\]

Answer 5

So since you have diameter, you know the radius is half of the diameter.

Answer 6

Or you can say it as: \[A=\frac{ 1 }{ 4 }\pi d^2\]

Answer 7

Either way you'll get the same answer so you can substitude A = pi*3^2 or use the formula above with 6 :)

Answer 8

ya

Answer 9

So what's your answer?

Answer 10

I wrote it :P, just point it out for me.

Answer 11

what?

Answer 12

What's your final answer? From your choices, with the information I gave you, which one will it be, I even wrote the answer.

Answer 13

i think it is d

Answer 14

Nope, remember I said radius = half of the diameter. And the area of a circle = pi*r^2

Answer 15

Half of 6 = 3, so your answer is A.

Answer 16

Oh wait

Answer 17

it is c

Answer 18

i think

Answer 19

You were right, it's D because 3^2 = 9

Answer 20

o ok hahaha

Answer 21

I didn't see the units :P

Answer 22

9(pi) in^2 the units haha, that's where they get you

Answer 23

ya