Given a sphere with a volume of 904.32 in3. Find the radius of the sphere. Take π as 3.14.
The picture below shows the sphere with the radius r inches.
Since the value of the volume, V and π are given, we can substitute them into the volume of a sphere formula as shown:
Now, notice that we can remove the fraction in the equation by multiplying both sides of the equation by 3. This is shown below:
We can now continue calculating...
Now, we have 12.56r3 = 2712.96. To get a step closer in finding r, we need to remove 12.56 by dividing both sides with 12.56. This is shown below:
Now, we have r3 = 216. Since r cube is a multiplication of r three times, we can find r by taking the cube root of 216. This is shown below:
Now, the calculated number 6, has no meaning until we include the unit for it. Since volume in unit inch3, r will be in inch. Hence:
Therefore, the answer is D.
Join our FB group to download ZapZapMath Free today!
Join our Facebook Group
No Thanks. My Kids Don't Need To Learn Math