The volume of the cylinder closed at one end is 1056cm cube. if its height is 21cm ,find its.
i)diameter.
ii)total surface area

The formula for the volume of a cylinder is . As the height and volume of the cylinder is given, the diameter of the cylinder can be computed with the following formula
.
This makes the diameter of the cylinder 64.0257 cm.
The area of a cylinder is . As the required quantities are known, the area of the cylinder is 10663.1461 cm^2 or 1.0663 m^2.

Figure it out your self

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.