How to find the diameter of a sphere - ISEE Upper Level Quantitative Reasoning
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There is a perfectly spherical weather balloon with a surface area of 
, what is its diameter?
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 diameter?
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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius 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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius to get our answer:
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There is a perfectly spherical weather balloon with a surface area of , what is its diameter?
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 diameter?
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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius 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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius to get our answer:
← Didn't Know|Knew It →
There is a perfectly spherical weather balloon with a surface area of , what is its diameter?
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 diameter?
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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius 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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius to get our answer:
← Didn't Know|Knew It →
There is a perfectly spherical weather balloon with a surface area of , what is its diameter?
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 diameter?
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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius 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 radius:
Now, because the question is asking for our diameter and not our radius, we need to double our radius to get our answer:
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