is this answer correct for TOTAL surface area of sphere?

Geometric formulae, word problems, theorems and proofs, etc.
kyl367
Posts: 6
Joined: Thu Feb 18, 2010 2:12 am
Contact:

is this answer correct for TOTAL surface area of sphere?

Postby kyl367 » Wed Mar 10, 2010 9:24 pm

d= 30 m

SURFACE AREA=
4 X 3.14(R^2)
4 X 3.14(15^2)
4 X 3.14(225)=
My answer is 2826

User avatar
stapel_eliz
Posts: 1737
Joined: Mon Dec 08, 2008 4:22 pm
Contact:

Postby stapel_eliz » Wed Mar 10, 2010 10:01 pm

What formula did they give you?

:wink:

kyl367
Posts: 6
Joined: Thu Feb 18, 2010 2:12 am
Contact:

Re: is this answer correct for TOTAL surface area of sphere?

Postby kyl367 » Wed Mar 10, 2010 10:33 pm

4 (pi/3.14) r^2

User avatar
stapel_eliz
Posts: 1737
Joined: Mon Dec 08, 2008 4:22 pm
Contact:

Re: is this answer correct for TOTAL surface area of sphere?

Postby stapel_eliz » Wed Mar 10, 2010 11:24 pm

That's the right formula. I don't know if you're supposed to round (using "3.14" instead of ), or if you're supposed to round so heavily. If "d" stands for "diameter", then your steps (other than the heavy rounding and truncation) look okay.

Note: Since "d" had units on it, then you'll need units on the answer. :wink:


Return to “Geometry”