We know that the cube has a volume of 27 cubic inches, so each side of the cube must be ∛27=3 inches. Since the cube is inscribed inside the sphere, the diameter of the sphere is the diagonal length of the cube, so the radius of the sphere is half of the diagonal length of the cube. To find the diagonal length of the cube, we use the distance formula d=√(3²+3²+3² )=√(3*3² )=3√3, and then divide the result by 2 to find the radius of the sphere, (3√3)/2.

S = 4π(r²)

100π = 4π(r²)

100 = 4r²

25 = r²

5 = r

In order to find the radius, first write the surface area formula for a sphere and substitute the surface area.

Divide by  on both sides in order to isolate the  term.

Simplify both sides of the equation.

Square root both sides.

The radius is .

Write the formula to find the surface area of a sphere.

Substitute the area and solve for the radius.

The diameter is double the radius.

Write the formula for the surface area of a sphere.

Substitute the area and find the radius.

The diameter is double the radius.

Write the formula for the volume of a sphere.

Substitute the volume.

Multiply by  on both sides in order to isolate the  term.

Cube root both sides.

The diameter is double the radius.

The answer is:  

The volume of a cube is found by V = s³.  Since V = 64, s = 4.  The side of the cube is the same as the diameter of the sphere.  Since d = 4, r = 2.  The surface area of a sphere is found by SA = 4π(r²) = 4π(2²) = 16π.

The surface area of the sphere before it was cut is equal to the following:

surface area of solid sphere = 4πr², where r is the length of the radius.

Each hemisphere will have the following shape:

In order to determine the surface area of the hemisphere, we must find the surface area of the flat region and the curved region. The flat region will have a surface area equal to the area of a circle with radius r.

area of flat part of hemisphere = πr²

The surface area of the curved portion of the hemisphere will equal one-half of the surface area of the uncut sphere, which we established to be 4πr².

area of curved part of hemisphere = (1/2)4πr² = 2πr²

The total surface area of the hemisphere will be equal to the sum of the surface areas of the flat part and curved part of the hemisphere.

total surface area of hemisphere = πr² + 2πr² = 3πr²

Finally, we must find the ratio of the surface area of the hemisphere to the surface area of the uncut sphere.

ratio = (3πr²)/(4πr²) = 3/4

The answer is 3/4.

To solve this, we must first begin by finding the radius of the sphere. To do this, recall that the volume of a sphere is:

V = (4/3)πr³

For our data, we can say:

2304π = (4/3)πr³; 2304 = (4/3)r³; 6912 = 4r³; 1728 = r³; 12 * 12 * 12 = r³; r = 12

Now, based on this, we can ascertain the surface area using the equation:

A = 4πr²

For our data, this is:

A = 4π*12² = 576π

To find the surface area, we must first find the radius.  Based on our description, this passes from (0,0) to (6,8).  This can be found using the distance formula:

6² + 8² = r²; r² = 36 + 64; r² = 100; r = 10

It should be noted that you could have quickly figured this out by seeing that (6,8) is the hypotenuse of a 6-8-10 triangle (which is a multiple of the "easy" 3-4-5).

The rest is easy.  The surface area of the sphere is defined by:

A = 4πr² = 4 * 100 * π = 400π