# Perimeter and Area of Semicircles

This video explains how to determine the perimeter and area of 4 semicircles or half circles.

# Volume of Stairs: Decomposing Volume (Right Rectangular Prisms)

This video explains how to decompose volume to determine the volume of a solid consisting to two boxes.

# Where Does the Number Pi Come From?

This video explains where pi comes from.

# Determine Irregular Perimeter and Area (Square and Half Circles)

This video explains how to determine an irregular perimeter and irregular area of a figure.

# Find the Length of a Missing Side of a Right Triangle and Perimeter and Area

This video explains how to apply the Pythagorean theorem to determine the length of a missing side of a right triangle. Then the perimeter and area of the triangle are found.

# Determine the Percent of a Volume of a Rectangular Pool (Box)

This video explains how to determine a percent of the volume of a right rectangular prism.

# Perimeter and Area of a Parallelogram (Decimals)

This video explains how to determine the perimeter and area of a parallelogram. The lengths are decimals.