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Mathematics 15 Online
OpenStudy (anonymous):

Find the slant height of the right cone.

OpenStudy (anonymous):

OpenStudy (anonymous):

First of all, do you see that the radius is 30?

OpenStudy (anonymous):

use a^2+b^2=c^2

OpenStudy (anonymous):

Yes, that makes D = 60.

OpenStudy (anonymous):

Yes. However, look. |dw:1342747306692:dw| Do you see how this happens and where it is in the cone?

OpenStudy (anonymous):

Mandonut, you can't use pythagorean theorem for a cone, there's no edges. That's like using a = 1/2bh for a circle.

OpenStudy (anonymous):

Oh yeah, that's a right triangle by the way.

OpenStudy (anonymous):

@mandonut is actually right. There is a right triangle inside the cone.

OpenStudy (anonymous):

Oops, I'm terrible at math. Sorry!

OpenStudy (anonymous):

|dw:1342747404648:dw| Do you see now?

OpenStudy (anonymous):

Noooo :P

OpenStudy (anonymous):

Do you see how that is a right triangle inside the cone?

OpenStudy (anonymous):

Oh, yes, I thought you meant do I get the answer.

OpenStudy (anonymous):

Yeah. From there, use Pythagorean Theorem: \[c^2 = a^2 + b^2\]\[c^2 = 40^2 + 30^2\]Find c and that is your answer :)

OpenStudy (anonymous):

I got 2500 as c^2.

OpenStudy (anonymous):

Ok. Now find the square root.

OpenStudy (anonymous):

50

OpenStudy (anonymous):

Yup. 50 is your answer.

OpenStudy (anonymous):

See? Math is not eville :)

OpenStudy (anonymous):

You got it?

OpenStudy (anonymous):

It is awful.

OpenStudy (anonymous):

Not really...once you get the concept, it's easy :)

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