This lesson teaches how to find the perimeter of two-dimensional figures on a coordinate plane. It reviews the Pythagorean theorem for calculating missing sides in right triangles, emphasizing that perimeter is found by adding all sides of a polygon. The lesson provides examples of finding the perimeter of a trapezoid and a parallelogram, using the Pythagorean theorem to calculate diagonal and height, respectively. Key mistakes, such as multiplying instead of adding sides, are highlighted.

What is the Pythagorean theorem used for?

• Determining the length of a side in a right triangle

• Calculating the volume of a cube

• Measuring the circumference of a rectangle

• Finding the area of a circle

When calculating the perimeter of a polygon, what is a common mistake students make?

• Subtracting the sides

• Dividing the sides

• Multiplying the sides

• Ignoring the sides

How do you find the diagonal of a trapezoid on a coordinate plane?

• By subtracting the height from the base

• By multiplying the base and height

• By using the Pythagorean theorem

• By adding all the sides

What is the perimeter of a trapezoid with sides 3, 7.2, 7, and 6 units?

• 23.2 units

• 27.2 units

• 20.2 units

• 25.2 units

How is the height of a parallelogram determined using the Pythagorean theorem?

• By creating a right triangle and solving for the hypotenuse

• By dividing the base by the height

• By adding the base and height

• By subtracting the base from the height