All ISEE Upper Level Math Resources
Example Questions
Example Question #3 : Spheres
You have a wooden ball which you are going to paint. If the radius is 12 inches, what is the volume of the ball?
You have a wooden ball which you are going to paint. If the radius is 12 inches, what is the volume of the ball?
Alright, let's begin with the volume of a sphere formula:
Now, plug in 12 and simplify:
Example Question #4 : Spheres
Find the volume of a sphere with a diameter of 6cm.
To find the volume of a sphere, we will use the following formula:
where r is the radius of the sphere.
Now, we know the diameter of the sphere is 6cm. We also know that the diameter is two times the radius. Therefore, the radius is 3cm.
Knowing this, we can substitute into the formula. We get
Now, before we continue, we can simplify. The 3 and the 27 can both be divided by 3. We get
Example Question #7 : How To Find The Volume Of A Sphere
Find the volume of a sphere with a diameter of 12in.
To find the volume of a sphere, we will use the following formula:
where r is the radius of the sphere.
Now, we know the diameter of the sphere is 12in. We also know the diameter is two times the radius. Therefore, the radius is 6in.
Knowing this, we can substitute into the formula. We get
Now, we can simplify before we multiply to make things easier. The 3 and a 6 can both be divided by 3. So, we get
Example Question #1 : How To Find The Volume Of A Sphere
Find the volume of a sphere with a diameter of 18in.
To find the volume of a sphere, we will use the following formula:
where r is the radius of the sphere.
Now, we know the diameter of the sphere is 18in. We also know the diameter is two times the radius. Therefore, the radius is 9in.
Knowing this, we can substitute into the formula. We get
Now, we can simplify before we multiply to make things easier. The 3 and a 9 can both be divided by 3. So, we get
Example Question #393 : Geometry
Find the volume of a sphere with a diameter of 6cm.
To find the volume of a sphere, we will use the following formula
where r is the radius of the sphere.
Now, we know the diameter of the sphere is 6cm. We also know the diameter is two times the radius. Therefore, the radius is 3cm.
So, we get
Example Question #1 : How To Find The Volume Of A Sphere
Find the volume of a sphere with the radius of .
Write the formula to find the volume of a sphere.
Substitute the radius into the formula.
Evaluate the equation.
The answer is:
Example Question #1 : How To Find The Surface Area Of A Sphere
In terms of , give the surface area, in square feet, of a spherical tank with diameter 36 inches.
36 inches = feet, the diameter of the tank. Half of this, or feet, is the radius. Set , substitute in the surface area formula, and solve for :
Example Question #2 : How To Find The Surface Area Of A Sphere
Give the surface area of a sphere with diameter .
A sphere with diameter has radius half that, or , so substitute into the formula for the surface area of a sphere:
Example Question #2 : How To Find The Surface Area Of A Sphere
A spherical buoy has a radius of 5 meters. What is the surface area of the buoy?
A spherical buoy has a radius of 5 meters. What is the surface area of the buoy?
To find the surface area of a sphere, use the following:
Plug in our radius and solve!
Example Question #3 : How To Find The Surface Area Of A Sphere
You have a wooden ball which you are going to paint. If the radius is 12 inches, what is the surface area of the ball?
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You have a wooden ball which you are going to paint. If the radius is 12 inches, what is the surface area of the ball?
First, recall the formula for surface area of a sphere:
Now, just plug in our known radius and simplify: