Q&A for How to Find the Surface Area of Cylinders

Divide the diameter by 2 to get the radius, then follow the formula after that.

Find the radius of one of the bases. Find the area of the base. Double the result to get the area of the top and bottom circles. Find the circumference of one of the circles. Multiply the circumference of the circle by the height of the cylinder. Add the lateral area and the base area.

Start by dividing the area of the base by pi. This will leave you with the radius squared (3.18 cm2). Next, take the square root of that to find your radius (1.78 cm). Multiply the radius by 2 pi to find the circumference (11.2 cm). Multiply the circumference by the height given and add the area of BOTH bases (20 cm2). This brings you to A) SA= 109.5 cm2 B) SA=92.7 cm2 C) SA=125.1 cm2.

If you want the area of the base, square the radius, and multiply by pi.

You will need to know either the radius of the cylinder or the height of the cylinder in addition to the volume. Then, you will be able to solve for the one you do not have and calculate surface area.

The area of a circle is the radius squared times by π, or Pi (3.142...). So you only need to do it backwards, 78.5 divided by Pi is 24.99 when simplified to 2 decimal places. Next find the square root of 24.99, which is 4.99 to 2 decimal places and the radius.

Square the radius and multiply by pi. That's the end or cross-sectional area. Divide that into the volume. That's the height.

Multiply the diameter by pi to find the circumference. Divide the circumference into the surface area. That gives you the height.

The circumference equals the diameter multiplied by pi.

If you're calculating the surface area of a cylinder, the thickness of the material does not matter, as long as you use the outside diameter measured from one outside surface to the opposite outside surface. If you're given only the inside diameter, you have to add twice the thickness of the material to find the outside diameter, which is what you need to calculate the surface area.

Find out the area of the top and bottom by using 90/360 x pi x r^2 and then double it. There are 2 equal rectangles at the wall of the cylinder. Find the area and double. Find circumference by pi x d and then multiply with 1/4. Then, subtract diameter from the result to get the arc length. Then, multiply arc with height and add the top and bottom area in the result.

If the cylinder only has one lid, then you only add the area of the outer edge and one base (since the second is missing).

Assuming you know the side surface area (not including the base areas), multiply the height by pi, then divide that product into the side surface area.

Multiply 27 by 12.

If you're asking about a cylinder, you would need more than the "width" and the radius. To find the height (or length) of a cylinder, you have to know the radius and either the volume or the lateral surface area.

Divide the volume by the height. Then divide that by pi. That gives you the square of the radius. Find the square root of that number. That's the radius. Double it to get the diameter.

It's πr² or (3.14)(16)(16).

The radius is half of the diameter, so just divide the diameter by 2.

The ratio of the diameters (and the radii) is 5:4. The ratio of the surface areas is 5² : 4² = 25:16. Set up a proportion: 25 : 16 = x : 110, where x is the first surface area. Cross-multiply: ((25)(110) = (16)(x). Divide both sides by 16: [(25)(110)] / 16 = x = (2750) / 16 = 171.875 sq cm.

Let h equal the height and the radius. Then the surface area is (h)(2πh) = 2πh² = 2772. So h² = 2772 / 2π = 2772 / 6.28 = 441.4. Then h = 21. The circumference is pi multiplied by twice the radius. (π)(2)(21) = 42π = 131.88 cm.

It can't be done. Knowing the surface area, you'd also need to know the height in order to find the radius, and vice versa.

It's complicated. See the Wikipedia article "Ellipsoid."

The diameter of any circle equals its circumference divided by pi. 20 / 3.14 = 6.37.

Divide the surface area by the height. That gives you the circumference. Divide the circumference by pi. That gives you the diameter. Divide the diameter by 2. That gives you the radius.

Measure how wide the enclosure will be (its diameter). Multiply the width by pi. That's how much fencing you need.

Assuming the torus has a circular cross-section, the area is pi multiplied by the square of the radius of the cross-section.

There's only one formula for the area of a circle, and that's pi multiplied by the square of the radius.

Knowing the total surface area is not enough. To find the radius, you would also have to know the height. To find the height, you would also have to know the radius.

Divide the volume by the height.

You have to know both the height and the radius (or diameter) in order to find the total surface area.