Answer: V≈3317.52 (exact) V=3315.84 (using 3.14)
Remember that the equation for the volume of a cylinder is V=πr²h. Since you were asked to substitute pi for 3.14, your answer should be a rough estimate of the exact volume.
First, you have to use the circumference (25.15) to find the radius.
To do so, all you have to do is divide the circumference by 3.14, since C=πd.
Using this formula, I got a diameter of 8. Next, I divided 8 by 2 to get the radius, (as the radius is always half of the diameter.
Next, you could solve the original equation for the volume.
V=(3.14)(4²)(66)
Since 4² is 16, 16(3.14)=50.24, and 50.24(66)=3315.84, this is the volume.
Hope this helps,
LaciaMelodii :)
