1. Drill
Use distance formula to find the distance between the two points given below:
(2, 5) and (8, 13)
2) Find the perimeter of a square if one of the sides is 7 feet.
3) Why couldn’t the perimeter of a shape be a negative number?

2. Chapter 5 Measuring In The Plane

3. 5.1 Basics of Areas and Perimeters (Squares & Rectangles)

4. Perimeter of a Polygon
The perimeter of a polygon is found by finding the sum of all the lengths of sides.
Ex:
22 ft.
12 ft.
13 ft.
10 ft.

5. Area of a Polygon
The area of a polygon is the number of square units enclosed by the polygon.
Ex: The square below encloses nine square units so we would say the square has an are of 9 sq.un.

6. Postulates
(5-1) The area of a square is the square of the length of the side.
AREA = (s)(s) =
(5-2) If two figures are congruent, then they have the same area.
(5-3) The area of a region is the sum of the areas of it’s overlapping parts.

7. Area of a Rectangle
The area of a rectangle is the product of its base and height.
height
base

8. Base H = 16 - B AREA 15 sq un 28 sq un 39 sq un 48 sq un 55 sq un7
63 sq un 8
64 sq un 9 15 14 13 12 11 10 9 8 7

9. DRILL Find the area of a square with a side length of 6.
Find the perimeter of a rectangle with a height of 5 and a length of 6.
What is the area of a square with a perimeter of 20 feet.

10. 5.2 Areas of Parallelograms and Triangles

11. Area of a Parallelogram
Area of a parallelogram is the product of the base and height.
Area = bh

12. Area = ½ bh Area of Triangle
The area of a triangle is ½ the product of the base and height.
Area = ½ bh

13. Find the Area and Perimeter of Each Figure

14. Homework
Pages 245 – 247
#’s 2 – 18 Evens
# 22
# 36
Pages 252 – 253
#’s 2 – 12 Evens