How can I find the area of this polygon without counting each square tile?

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Presentation transcript:

How can I find the area of this polygon without counting each square tile?

In this lesson you will learn how to find the area of a polygon by adding the area of smaller rectangles.

Let’s Review Area tells us the amount of space a polygon takes up. Area

Length Width

4 units 3 units 4 x 3 =12 square units

A Common Mistake Multiplying the two straight side lengths. I added in two bars that appear to show multiplying the two sides before you bring out the whole rectangle.

Core Lesson 5 units 2 units 5 x 2 = 10 square units

10 square units 3 units 3 units 3 x 3 =9 square units

10 square units 9 s q u a r e u n i t s 10 square units + 9 square units 19 square units

Hey Valerie, Do you think you can edit slides based on my revisions to slides 7-9? I have so many other slides to get through and I think you have a good handle on how to do this. The biggest things are: - Making sure text comes in letter by letter - Making sure all animation comes in in a logical order and that the slide starts blank As always let me know if you have questions!

Core Lesson 7 units 2 units 7 x 2 =14 square units

Core Lesson 14 square units 2 units 2 x 2 =4 square units 4 square units

Core Lesson 14 square units 4 square units 2 units 4 units 4 x 2 =8 square units

Core Lesson 14 square units 4 square units 8 square units 14 square units + 4 square units + 8 square units 26 square units

In this lesson, you have learned how to find the area of a polygon by multiplying. Whoops! This objective does not match slide 2– I think that slide 2 is the one you want to use, but I wanted to double check.

Guided Practice How can I find the area of this polygon without counting each square tile?

Extension Activities Draw 5 polygons with more than 4 sides on grid paper. Find the area of each polygon by breaking them into smaller rectangles and adding the areas.

Extension Activities Find the area of the following polygons.

Quick Quiz Find the area of the following shape.

Find the area of the following shape.