Perimeter and Circumference Concepts

The video tutorial covers the concept of perimeter, focusing on composite figures. It explains the perimeter of basic shapes like triangles and circles, introducing the term 'circumference' for circles. The tutorial provides an example of a composite figure made of a square and a half circle, demonstrating how to calculate its perimeter. The process involves determining the length of the half circle using the formula C = πD, and then adding it to the known lengths of the square's sides. The final perimeter of the composite figure is calculated to be 18.3 centimeters.

What is the perimeter of a shape?

• The distance around a 2D shape

• The length of a diagonal

• The area inside a shape

• The volume of a 3D object

Which of the following is another term for the perimeter of a circle?

• Radius

• Circumference

• Diameter

• Area

How is the radius of a circle related to its diameter?

• The radius is unrelated to the diameter

• The radius is twice the diameter

• The radius is half the diameter

• The radius is equal to the diameter

In the example problem, what shapes make up the composite figure?

• A rectangle and a circle

• A square and a half circle

• A square and a triangle

• A triangle and a square

What is the diameter of the half circle in the example problem?

• 5 centimeters

• 4 centimeters

• 3 centimeters

• 2 centimeters

Which formula is used to calculate the circumference of a circle?

• Both A and B

• C = 2πr

• C = πd

• C = πr²

What is the length of the half circle in the example problem?

• 12.6 centimeters

• 6.3 centimeters

• 8.4 centimeters

• 4.2 centimeters

What is the length of one side of the square in the example problem?

• 5 centimeters

• 2 centimeters

• 4 centimeters

• 3 centimeters

How do you find the total perimeter of the composite figure in the example?

• Subtract the length of the half circle from the square

• Add the lengths of the square and the half circle

• Multiply the lengths of the square and the half circle

• Add the area of the square and the half circle

What is the total perimeter of the composite figure in the example?

• 18.3 centimeters

• 22.3 centimeters

• 20.3 centimeters

• 16.3 centimeters