Calculating Area and Perimeter of Polygons

In this lesson, students learn to determine the area and perimeter of polygons on a coordinate plane. The teacher guides through calculating the perimeter by summing line segment lengths and finding the area using rectangles and triangles. Two methods for area calculation are demonstrated, and students are encouraged to practice with provided examples. The lesson concludes with a summary and encouragement to apply the learned concepts.

What is the primary goal of lesson 9?

• To understand the concept of symmetry in polygons

• To explore different types of polygons

• To determine the area and perimeter of polygons on the coordinate plane

• To learn about the history of polygons

Why does Josette need to calculate the perimeter of her garden?

• To determine the amount of paint needed

• To know how much fencing to purchase

• To decide the number of plants to grow

• To calculate the garden's volume

How is the perimeter of a polygon calculated?

• By multiplying the lengths of all sides

• By dividing the total length by the number of sides

• By adding the lengths of all sides

• By subtracting the lengths of all sides

What is the area of the larger rectangle in the example?

• 40 square units

• 76 square units

• 52 square units

• 24 square units

How is the area of an irregular polygon calculated using rectangles?

• By measuring the perimeter and dividing by two

• By dividing the polygon into triangles

• By dividing the polygon into rectangles and summing their areas

• By using the formula for regular polygons

What is the base length of triangle FCB in the example?

• 6 units

• 4 units

• 10 units

• 8 units

What is the area of the hexagon calculated using triangles?

• 60 square units

• 48 square units

• 24 square units

• 36 square units

Which method involves dividing the polygon into two triangles and a rectangle?

• Method 2

• Method 1

• Method 4

• Method 3

What is the total area of the shape calculated using the second method?

• 24 square units

• 36 square units

• 48 square units

• 60 square units

What should students do after watching the video?

• Ignore the video content

• Review their notes

• Take a break

• Start a new lesson