How to find the radius of a sphere - ISEE Upper Level Quantitative Reasoning
Card 1 of 8
A wooden ball has a surface area of 
.
What is its radius?
A wooden ball has a surface area of
What is its radius?
Tap to reveal answer
A wooden ball has a surface area of 
.
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
A wooden ball has a surface area of
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
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There is a perfectly spherical weather balloon with a surface area of 
, what is its radius?
There is a perfectly spherical weather balloon with a surface area of
Tap to reveal answer
There is a perfectly spherical weather balloon with a surface area of 
, what is its radius?
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by 
.
Then square root both sides to get our answer:
There is a perfectly spherical weather balloon with a surface area of
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by
Then square root both sides to get our answer:
← Didn't Know|Knew It →
A wooden ball has a surface area of .
What is its radius?
A wooden ball has a surface area of
What is its radius?
Tap to reveal answer
A wooden ball has a surface area of .
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
A wooden ball has a surface area of
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
← Didn't Know|Knew It →
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
There is a perfectly spherical weather balloon with a surface area of
Tap to reveal answer
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by .
Then square root both sides to get our answer:
There is a perfectly spherical weather balloon with a surface area of
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by
Then square root both sides to get our answer:
← Didn't Know|Knew It →
A wooden ball has a surface area of .
What is its radius?
A wooden ball has a surface area of
What is its radius?
Tap to reveal answer
A wooden ball has a surface area of .
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
A wooden ball has a surface area of
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
← Didn't Know|Knew It →
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
There is a perfectly spherical weather balloon with a surface area of
Tap to reveal answer
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by .
Then square root both sides to get our answer:
There is a perfectly spherical weather balloon with a surface area of
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by
Then square root both sides to get our answer:
← Didn't Know|Knew It →
A wooden ball has a surface area of .
What is its radius?
A wooden ball has a surface area of
What is its radius?
Tap to reveal answer
A wooden ball has a surface area of .
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
A wooden ball has a surface area of
What is its radius?
Begin with the formula for surface area of a sphere:
Now, plug in our surface area and solve with algebra:
Get rid of the pi
Divide by 4
Square root both sides to get our answer:
← Didn't Know|Knew It →
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
There is a perfectly spherical weather balloon with a surface area of
Tap to reveal answer
There is a perfectly spherical weather balloon with a surface area of , what is its radius?
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by .
Then square root both sides to get our answer:
There is a perfectly spherical weather balloon with a surface area of
Begin with the formula for surface area of a sphere:
Now, set it equal to the given surface area and solve for r:
First divide both sides by
Then square root both sides to get our answer:
← Didn't Know|Knew It →