Question

Please help!! Will fan and medal! You are creating a cone-shaped hat for a kid’s costume. You measure the circumference of the child’s head and find it to be 20.5 inches. Determine the radius of the hat.
You want the hat to have a slant height of 8 inches. Draw an image that models this situation and include all of the measurements you know. How much material would you need to make the hat?

Answer 1

\[C=2 \pi r\]

Answer 2

Isn't the circumference already included in the question?

Answer 3

yes but you're supposed to determine the radius which the knuclehead @Shroomsy already did. Apparently @Shroomsy hasn't read the Code of Conduct (below left).

Answer 4

Oh, dang, sorry. I just joined, just tryin to help :)

Answer 5

doesn't matter because @Shroomsy gave the wrong answer anyways.

Answer 6

I understand... but check out the code. Here, it's about helping people learn to do for themselves and not just giving out answers.

Answer 7

To get the diameter, divide the circumference by 3.14, then divide the diameter by 1/2
Is that better?

Answer 8

@mw647 you can use the formula and the value of the circumference to find the radius.

Answer 9

getting there... keep up the good work!

Answer 10

Thanks :D

Answer 11

@pgpilot326 is the radius 3.2627?

Answer 12

that's what i'm getting... good job!

Answer 13

:) Alright so how would I find out how much material is needed?

Answer 14

you need the formula for the surface area of a cone (a right cone, to be specific). you'll also need the height of the hat. they gave you the "slant" height. can you draw a representation of the hat?