Finding Area and Perimeter of Polygons

Mrs. Hebert guides sixth-graders through lesson 14.2, focusing on polygons in the coordinate plane. The lesson covers definitions of key terms, plotting points to form shapes, and calculating both perimeter and area of polygons. Students are instructed to take notes and follow along with examples provided in the video.

What is the definition of a polygon?

• A shape with curved lines

• A closed figure formed by three or more line segments

• A shape that is open

• A figure with only two sides

What is the first step in plotting points to form a polygon?

• Plot points on a coordinate plane

• Erase the coordinate plane

• Draw a circle

• Connect the points randomly

When plotting points, what does the first coordinate in an ordered pair represent?

• The y-axis

• The diagonal axis

• The z-axis

• The x-axis

How do you find the perimeter of a polygon on a coordinate plane?

• By adding the lengths of all sides

• By multiplying all the sides

• By dividing the lengths of all sides

• By subtracting the lengths of all sides

In the perimeter example, what is the distance from the library to the park?

• 4 blocks

• 5 blocks

• 2 blocks

• 7 blocks

What is the first step in finding the area of a polygon on a coordinate plane?

• Erase the coordinate plane

• Graph the vertices and connect them in order

• Multiply the coordinates

• Draw a circle around the polygon

How do you calculate the area of a rectangle?

• Base divided by height

• Base times height

• Base minus height

• Base plus height

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

• 25 square feet

• 15 square feet

• 10 square feet

• 20 square feet

What is the final step in finding the area of a polygon?

• Divide the areas of the known shapes

• Subtract the areas of the known shapes

• Add the areas of the known shapes

• Multiply the areas of the known shapes

What is the total area of the polygon in the example?

• 35 square feet

• 20 square feet

• 25 square feet

• 30 square feet