Calculating Area and Perimeter of Polygons

Mrs. Becker introduces lesson 9, focusing on determining the perimeter and area of polygons on the coordinate plane. The lesson includes examples of calculating the perimeter and area of a garden, using different methods to find the area of polygons, and practice problems from the textbook. Students are encouraged to try different methods and use mental math for calculations. The lesson concludes with instructions for homework on pages 52-53.

What is the primary focus of Mrs. Becker's lesson?

• Learning about angles and their measurements

• Determining the volume of 3D shapes

• Calculating the perimeter and area of polygons

• Understanding the properties of circles

How do you calculate the perimeter of a polygon?

• By subtracting the lengths of all sides

• By dividing the lengths of all sides

• By multiplying the lengths of all sides

• By adding the lengths of all sides

What is the perimeter of the polygon in the example given by Mrs. Becker?

• 36 units

• 42 units

• 50 units

• 48 units

How can you calculate the area of a polygon using rectangles?

• By multiplying the base and height of each rectangle

• By subtracting the base from the height of each rectangle

• By adding the perimeters of the rectangles

• By dividing the base by the height of each rectangle

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

• 64 units squared

• 72 units squared

• 76 units squared

• 84 units squared

What alternative method does Mrs. Becker suggest for calculating the area of polygons?

• Using circles and ellipses

• Using lines and angles

• Using trapezoids and triangles

• Using cubes and spheres

How many triangles are used in the alternative method example?

• Five

• Four

• Three

• Two

What is the total area of the polygon using the alternative method?

• 72 units squared

• 36 units squared

• 48 units squared

• 60 units squared

What pages are students instructed to work on for practice?

• Pages 54 and 55

• Pages 52 and 53

• Pages 50 and 51

• Pages 45 and 46

What should students do if they get a different answer using a different method?

• Use a calculator to verify

• Redo the problem using the same method

• Ask Mrs. Becker for clarification

• Ignore the difference