Having Trouble Area Problems.

[nolancho]

Here are the few problems im stuck on. Please help, I've really tried.

1. The mean of the radius of the Earth is 6,371 km, and 70.8% of its surface is covered by water. What is the surface area of the Earth covered by land?


2. A can of silly string will produce 400 ft of string. What is the diameter of the largest circle you can make with that silly string?

3. The mean of the diameter of the Earth is 12,742 km. What is the volume of the Earth?

4. The volume of hot air balloons 17000m^3. Assuming that the hot air balloon is completely spherical, what is the radius of the hot air balloon?

 

[tkhunny]

\(\displaystyle Sphere\;Surface\;Area\;=\;4\pi r^{2}\)

 

[Denis]

2. A can of silly string will produce 400 ft of string. What is the diameter of the largest circle you can make with that silly string?

If you can't do this one, you need classroom help...

 

[Deleted member 4993]

Here are the few problems im stuck on. Please help, I've really tried.

1. The mean of the radius of the Earth is 6,371 km, and 70.8% of its surface is covered by water. What is the surface area of the Earth covered by land?


2. A can of silly string will produce 400 ft of string. What is the diameter of the largest circle you can make with that silly string?

Circumference of a circle = ? * D

3. The mean of the diameter of the Earth is 12,742 km. What is the volume of the Earth?

Volume of a sphere = ?/6 * D[sup:2lpggimz]3[/sup:2lpggimz]

4. The volume of hot air balloons 17000m^3. Assuming that the hot air balloon is completely spherical, what is the radius of the hot air balloon?

Volume of a sphere = ?/6 * D[sup:2lpggimz]3[/sup:2lpggimz]

 

[mmm4444bot]

Please help, I've really tried.

If you need more help, please show us what you've tried.

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Cheers