1 This pool measures 25 ¼ feet by 80 feet.
What is the perimeter of the pool?

Objective :

2 Objective Solve real-world problems involving area and perimeter.

Determining Perimeter :

3 Determining Perimeter

Slide 4:

4 Equation:
P = 15 + 12 + 13
P = 30 m Tom is going to put a fence around his rock garden. His garden is in the shape of a triangle with the sides measuring 15 m, 12 m and 13 m.
How much fence does he need?

Slide 5:

5 6 + 7 + 8 + 8 = P
P = 29 inches

Finding the Area? :

6 Finding the Area? How do you find the area of a square?
How do you find the area of a rectangle?
How do you find the area of a triangle?

Formulas :

7 Formulas Triangle = ½ x base x height
Rectangle = length x width
Square = s2

Area of a Triangle :

8 Area of a Triangle Calculate the area of each triangle. 5 cm 3 cm 10 ft 12 ft 13 ft 13 ft 4 cm

Area of a Rectangle :

9 Area of a Rectangle Calculate the area of each rectangle.
4 ft
7 m
12 ft
5 m

Area of a Square :

10 Area of a Square Calculate the area of the square.

Area of a Square :

11 Area of a Square Calculate the area of each square. 2 cm

Area of a Rectangle :

12 Area of a Rectangle Calculate the area of the rectangle by
multiplying length times width.
A = L × W
= 9 × 3
= 27 cm2

Area of a Triangle :

13 Area of a Triangle Area = ½ × base × height height base base height

Area of a Triangle :

14 Area of a Triangle Area = ½ × base × height 10 in 4 in 6 m 8 m A = ½ × 6 × 8
= 3 × 8
= 24 m2 A = ½ × 4 × 10
= 2 × 10
= 20 in2

Triangle vs. Rectangle :

15 Triangle vs. Rectangle Base = length Height = width Area of Triangle = ½ of Area of Rectangle
= ½ (L × W) or ½ (base × height)

Example :

16 Example A typical size for a photograph is
8 × 10 inches.
What is the area of the photo?

Example :

17 Example Mr. Liddle is re-painting his chalkboard and
needs to know its area in order to buy enough
paint. His chalkboard is 4 ft tall and 6 ft long.
What is the area of the chalkboard?

Demonstration :

18 Demonstration Marie is making a quilt by cutting fabric squares
diagonally across into triangles.
What is the area of each triangle created from a
4-inch square? 4 in 4 in 4 in

Demonstration :

19 Demonstration Area of triangle = ½ × base × height
= ½ × 4 × 4 = 8 in2

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