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3.

## Surface Area of Prisms [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the surface area of right rectangular prisms. Since opposite faces of the prism are congruent, we can find the area of the base and multiply it by 2 in order to account for the surface area of the top and bottom; find the area of the left face and multiply it by 2 in order to account for the surface area of the left and right; and find the area of the front face and multiply it by 2 in order to account for the surface area of the front and back.

Online

2015; 2014

4.

Online

2015; 2014

7.

## Surface Area of Pyramids [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the surface area of regular pyramids. Since all of the lateral faces of the pyramid are congruent, we can always use the same formula for surface area. We'll just need to know the perimeter of the base, the slant height of the lateral faces, and the area of the base.

Online

2015; 2014

10.

## Surface Area of Cylinders [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the surface area of cylinders, which we'll do by finding the area of the base (the area of a circle), and multiplying that by 2 to account for the surface area of the top and the bottom of the cylinder. The surface area of the side we'll find by recognizing that the side is a rectangle with length equal to the circumference of the circular base, and width equal to the height of the cylinder.

Online

2015; 2014

11.

## Nets of Cones [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to draw nets of right circular Cones. A right circular cone is a cone whose base is a circle and that has a right angle (90-degree angle) between the base of the cone and it's altitude. A net is the two-dimensional shape that can be folded into the three-dimensional object.

Online

2015; 2014

13.

## Surface Area of Cones [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the surface area of right circular Cones. A right circular cone is a cone whose base is a circle and that has a right angle (90-degree angle) between the base of the cone and it's altitude. When we find the surface area of a cone, we'll use the formula for the area of a circle in order to find the area of the base of the cone, and then we'll use the slant height of the cone in order to find the surface area of the lateral face.

Online

2015; 2014

14.

## Volume of Spheres [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the volume of Spheres. We'll always use the same volume formula, which only requires us to know the length of the radius of the sphere. If we've been given the length of the diameter, we can just take half of the diameter to get the radius, and then plug the radius into the volume formula.

Online

2015; 2014

15.

## Surface Area of Spheres [electronic resource]: Geometry-Three-Dimensional Geometry

In this video we'll learn how to find the surface area of Spheres. The formula we always use to find surface area only requires us to know the length of the radius of the sphere. If we know the diameter of the sphere, we can take half of it to get the radius, and then plug the length of the radius into the equation for surface area.

Online

2015; 2014