Surface Areas and Volumes Formulas Explained: Cuboids, Cylinders, Cones, and Spheres

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What is the formula for calculating the total surface area of a cuboid?

Surface Area (SA) = 2lw + 2lh + 2wh

In a cylinder, what does the total surface area include?

The total surface area of a cylinder includes the lateral surface area and the areas of the two bases.

What is the formula for the lateral surface area of a cone?

Lateral Surface Area (LSA) = πr * l

How is the total surface area of a cone calculated?

Surface Area (SA) = πr² + πr * l

What is the formula for the volume of a cylinder?

Volume = πr²h

What is the formula for the volume of a sphere?

Volume = (4/3)πr³

Calculate the lateral surface area of a cone with radius 5 units and slant height 13 units.

65π square units

If the height of a cylinder is 8 units and the radius is 3 units, what is the total surface area of the cylinder?

78π square units

A cuboid has dimensions: length = 4 units, width = 6 units, height = 7 units. Calculate its total surface area.

188 square units

Find the volume of a cylinder with a radius of 5 units and a height of 10 units.

250π cubic units

Study Notes

Surface Areas and Volumes: A Deep Dive into Cuboids, Cylinders, Cones, and Spheres

In the realm of mathematics and geometry, surface areas and volumes play a crucial role in understanding and solving various three-dimensional problems. In this article, we will explore the formulas for calculating the surface areas of cuboids, cylinders, and cones, as well as the volume formulas for cylinders and spheres.

Surface Areas

  1. Cuboids

A cuboid is a three-dimensional shape with six rectangular faces. To find the total surface area of a cuboid, you simply add the areas of all six faces. The formula is:

Surface Area (SA) = 2lw + 2lh + 2wh

where l is the length, w is the width, and h is the height of the cuboid.

  1. Cylinders

A cylinder has two circular bases and a straight axis connecting them. The surface area consists of the lateral surface area (circular discs connecting the bases) and the areas of the two bases. The formula for the total surface area of a cylinder is:

Surface Area (SA) = 2πr² + 2πrh

where r is the radius of the circle (the same for both bases) and h is the height of the cylinder.

  1. Cones

A cone has a circular base and a curved surface connecting the base to a vertex. The formula for the lateral surface area of a cone is:

Lateral Surface Area (LSA) = πr * l

where r is the radius of the base and l is the slant height of the cone. The total surface area of a cone (lateral + base) is:

Surface Area (SA) = πr² + πr * l

Volumes

  1. Cylinders

The volume of a cylinder is the amount of space it occupies. Its formula is:

Volume (V) = πr²h

where r is the radius and h is the height of the cylinder, as before.

  1. Spheres

A sphere is a three-dimensional shape with all points equidistant from its center. The formula for the volume of a sphere is:

Volume (V) = (4/3)πr³

where r is the radius of the sphere.

These formulas will help you solve a wide range of three-dimensional problems that involve surface areas and volumes. By understanding these concepts, you'll be better equipped to tackle mathematical challenges and apply them in practical settings, such as in engineering, architecture, and applied physics.

Explore the surface area formulas for cuboids, cylinders, and cones, along with the volume formulas for cylinders and spheres. Understand how to calculate the total surface area and volume of these three-dimensional shapes using the given formulas.

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