# Finding Area and Perimeter

Views:

Category: Education

## Presentation Description

No description available.

## Presentation Transcript

### Slide 1:

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