Posted by lilman on Sunday, April 29, 2012 at 11:15am.
I really need some help, I don't fully understand. Exspecially with fractions, don't know how to enter them on calculator.
1. What is the approximate volume of the sphere?
524 m³ (my choice)
2. What is the approximate surface area of the sphere?
1,767 yd2 (my choice)
3. What is the approximate volume of the sphere if the surface area is 482.8 mm²?
2,042 mm ³
I don't understand this one.
4. What is the approximate surface area of the sphere?
5. What is the approximate radius of a sphere whose volume is 1,349 cm³?
- surface area and volume - Reiny, Sunday, April 29, 2012 at 12:59pm
you are dealing with two equations
1. surface area of sphere = 4π r^2
2. volume of sphere = (4/3)π r^3
notice all you need is the radius.
Since we cannot see your diagrams, #1, and #2 cannot be checked
3. given 4πr^2 = 482.8
r^2 = 482.8/(4π) = 38.42
r= √38.42 = 6.198
volume = (4/3)πr^3 = 997.53 , looks like a)
you must have the radius given to you, just plug into the formula
(4/3)πr^3 = 1349
r^3 = 1349/((4/3)π) = 322.05
r= (322.05)^(1/3) , the cube root of 322.05
= 6.85 (looks like b) )
fractions are really just divisions
e.g. 3/4 = 3 ÷ 4 = .75
you calculator should have a key for π
for powers look for key such as yx or a variation of that
to do 322.05^(1/3) I entered
to get 6.85447...
- surface area and volume - Hannah, Monday, April 28, 2014 at 8:40am
number 2 is wrong its b. 707 yd^2.
- surface area and volume - Hannah is right, Monday, April 27, 2015 at 9:10pm
1. 524 m^3 (A)
2. 707 yd^2 (B)
3. 998 mm^3 (A)
4. 451.9 km^2 (B)
5. 6.9 cm (B)
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