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# 4b area of polygons

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### 4b area of polygons

1. 1. 4b: Use formulas and strategies, such as decomposition, to compute the perimeter and area of triangles, parallelograms, trapezoids, the circumference and area of circles, and find the area of more complex shapes. (DOK 2)<br />By: Deia Sanders<br />
2. 2. Perimeter<br />The Perimeter of a polygon is the distance around it.<br />Because a square and a rectangle are special types of polygons, they have a special perimeter formula. The triangle and any other unknown-sided polygon will use the “sum of all the sides” as the formula.<br />Square = 4s (s is the length of the side)<br />Rectangle = 2(l + w) (l is the length and w is the width)<br />All other polygons = add the sides<br />
3. 3. Let’s Review Examples on Page 66<br />
4. 4. Homework:<br />Handout #1 <br />Page 93<br />
5. 5. Day 2<br />Area of Polygons!!!<br />
6. 6. Area of Polygons<br />Triangle: A = ½ bh<br />Parallelogram: A = bh<br />Square: A = s2<br />Rectangle: A = lw<br />
7. 7. Let’s work examples on pages 67-69 <br />
8. 8. Homework<br />Handout #2 <br />Page 95<br />
9. 9. Day 3<br />Area of Trapezoids!!!<br />
10. 10. Area of Trapezoid<br />Trapezoid: 1/2h(b1 + b2)<br />
11. 11. Let’s work examples on pages 69-72!!<br />
12. 12. Homework <br />Handout #3 <br />Page 97<br />
13. 13. Day 4<br />Circumference and Area of Circles!!!<br />
14. 14. Circumference of a Circle<br />Circumference: C = pi(d)<br />Circumference is the distance around a circle<br />Let’s look at page 73!<br />
15. 15. Area of a Circle<br />The area of a circle is the region or space inside the circle. <br />The measurement will be measured in square units.<br />Let’s look at page 73!<br />
16. 16. Homework<br />Handout #4<br />Page 99<br />
17. 17. Day 5<br />Irregular Polygons!!!<br />
18. 18. Irregularly Shaped Polygons<br />Step 1. Break down the original figure into more basic shapes, such as squares, rectangles, triangles, or circles.<br />Step 2. Find the area of the basic shapes using the formulas.<br />Step 3. Combine the areas of the basic shapes so that the area of the irregularly shaped polygon can be determined. <br />
19. 19. Lets look at pages 74 and 75!!!<br />
20. 20. Homework<br />Handout #5<br />Page 101<br />