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Area of Rectangles © 2007 M. Tallman.

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Presentation on theme: "Area of Rectangles © 2007 M. Tallman."— Presentation transcript:

1 Area of Rectangles © 2007 M. Tallman

2 Square Units square units- a unit for measuring area, such as a square inch or a square centimeter. 1 square inch 1 square centimeter or or 1 inch² 1 centimeter² © 2007 M. Tallman

3 Area A = 15 units² A = 28 units² A = 20 units² A = 16 units²
Area (A)- the amount of surface area (space) inside a closed figure, measured in square units or units². A = 15 units² A = 28 units² A = 20 units² A = 16 units² © 2007 M. Tallman

4 Length (ℓ)- a side (usually the bottom) of a polygon.
Length and Width Length (ℓ)- a side (usually the bottom) of a polygon. Width (w)- the measurement of a perpendicular line drawn from the length to the top of the polygon. w Perpendicular Lines w w w © 2007 M. Tallman

5 Area of a Rectangle or Square
If you know the length (ℓ) and the width (w) of a rectangle or square, you can use a formula to find its area. If you multiply the ℓ × w, you get the area (A). A = ℓ × w or A = ℓw A = 4 cm × 1 cm A = 4 cm² A = 5 cm × 3 cm A = 15 cm² A = 6 cm × 6 cm A = 36 cm²

6 Area b : 8 8 cm h : 4 cm 4 × = 32 A = 32 cm² © 2007 M. Tallman

7 Area b : 6 6 in h : 5 in 5 × = 30 A = 30 in² © 2007 M. Tallman

8 Area b : 3 ft 3 h : 6 ft 6 × = 18 A = 18 ft² © 2007 M. Tallman

9 Area b : 9 ft 9 h : 3 ft 3 × = 27 A = 27 ft² © 2007 M. Tallman

10 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. 4 ft 12 ft A = 12 ft × 4 ft A = 48 ft² © 2007 M. Tallman

11 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. 9 cm A = 9 cm × 11 cm 11 cm A = 99 cm² © 2007 M. Tallman

12 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. 7 yd 7 yd A = 7 yd × 7 yd A = 49 yd² © 2007 M. Tallman

13 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. 2 m 6 m A = 6 m × 2 m A = 12 © 2007 M. Tallman

14 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. 3 in A = 3 in × 4 in 4 in A = 12 in² © 2007 M. Tallman

15 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. A = 66 units² © 2007 M. Tallman

16 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. A = 45 units² © 2007 M. Tallman

17 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. A = 24 units² © 2007 M. Tallman

18 Use the formula A = ℓw to find the area of the rectangle or square.
Your Turn! Use the formula A = ℓw to find the area of the rectangle or square. A = 32 units² © 2007 M. Tallman


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