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December 22, 2014

December 22, 2014

Posted by **Yulia** on Tuesday, August 25, 2009 at 12:04am.

What is the volume in cubic cm of a sphere with radius 2 cm?

is it =

33.51032163829112

What is the area in m2 of a triangle with base 2.8 m and height of 10.4 m?

is it =

14.56

A sphere has a volume of 106 cm3. What is its radius (in cm)?

is it =

is it 6.297560287884612?

that doesnt look right :/

- physics -
**DrBob222**, Tuesday, August 25, 2009 at 12:46amYou have far too many numbers after the decimal point but the first one is right. The second one is right. And you are correct about the fourth one; i.e., it doesn't look right and isn't.

V = 4/3(pi)r^3 = 106

I get something like 3 but that isn't exact.

- physics -
**DrBob222**, Tuesday, August 25, 2009 at 12:50amI re-read the problem and you are asking about sig fig.

For the first one, if 2 cm is the correct number (not 2.0 or 2.00), then you have only one sig fig so 33.51 would be rounded to 30.

For the second one, you are allowed 2; therefore, round to 15

For the third one, you are allowed 3 figures.

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