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Quadrilaterals II by Monica Yuskaitis. Copyright © 2000 by Monica Yuskaitis Quadrilateral Family parallelogram rectangle rhombus square trapezoid.

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Presentation on theme: "Quadrilaterals II by Monica Yuskaitis. Copyright © 2000 by Monica Yuskaitis Quadrilateral Family parallelogram rectangle rhombus square trapezoid."— Presentation transcript:

1 Quadrilaterals II by Monica Yuskaitis

2 Copyright © 2000 by Monica Yuskaitis Quadrilateral Family parallelogram rectangle rhombus square trapezoid

3 Copyright © 2000 by Monica Yuskaitis Definition Perimeter – (P) The distance around a figure. 5 in. 9 in in.

4 Copyright © 2000 by Monica Yuskaitis Find the perimeter 9 cm cm. A shortcut for the square is 4 x side.

5 Copyright © 2000 by Monica Yuskaitis Find the perimeter 9 cm. 7 cm cm.

6 Copyright © 2000 by Monica Yuskaitis Find the perimeter 10 ft. 6 ft ft.

7 Copyright © 2000 by Monica Yuskaitis Find the perimeter 12 m. 15 m. 18 m. 11 m m.

8 Copyright © 2000 by Monica Yuskaitis Definition Area – (A) the measure, in square units, of the surface of a figure. The area of this rectangle is 8 squares.

9 Copyright © 2000 by Monica Yuskaitis How to find the area of a square or rectangle. 3 cm. 5 cm. Step 1 – Multiply the length times the width. (A = l x w) 5 3 x 15

10 Copyright © 2000 by Monica Yuskaitis How to find the area of a square or rectangle. 3 cm. 5 cm. Step 2 – Indicate that the answer is in square centimeters by writing the exponent 2 after the unit of measure. 5 3x 15cm. 2

11 Copyright © 2000 by Monica Yuskaitis How to find the area of a square or rectangle. 3 cm. 5 cm. Step 3 – Read the answer: 15 square centimeters. 5 3x 15cm. 2

12 Copyright © 2000 by Monica Yuskaitis What is the area? 5 ft. 6 ft. 5 6x 30ft. 2 You say: 30 square feet.

13 Copyright © 2000 by Monica Yuskaitis What is the area? 2 in. 6 in. 2 6x 12in. 2 You say: 12 square inches.

14 Copyright © 2000 by Monica Yuskaitis What is the area? 4 m. 7 m. 7 4x 28m. 2 You say: 28 square meters.

15 Copyright © 2000 by Monica Yuskaitis How to find the area of a parallelogram height base Step 1 – Multiply the base times the height. (A = b x h) 90º

16 Copyright © 2000 by Monica Yuskaitis How to find the area of a parallelogram height base Step 1 – Multiply the base times the height. (A = b x h) x 90º 17 in. 13 in

17 Copyright © 2000 by Monica Yuskaitis How to find the area of a parallelogram height base Step 2 – Indicate that the answer is in square inches by writing the exponent 2 after the unit of measure x 90º 17 in. 13 in in. 2

18 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 First find the area.

19 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 Cut off the piece at the dotted line.

20 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 Cut off the piece at the dotted line.

21 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 Move this piece to the other side.

22 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 Move this piece to the other side.

23 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram base 4 cm, 90º height 2 cm. 4 x 2 = 8 cm. 2 Now you have a rectangle 4 x 2 cm.

24 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram length 4 cm, width 2 cm. 4 x 2 = 8 cm. 2 What is the area of this rectangle?

25 Copyright © 2000 by Monica Yuskaitis How to check the area of a parallelogram length 4 cm, width 2 cm. 4 x 2 = 8 cm. 2 Thats right! 8 cm 2 The same as the parallelogram.

26 Copyright © 2000 by Monica Yuskaitis What is the area of this parallelogram? base 7 cm. height 5 cm. 5 7 x 35cm. 2 You say: 35 square centimeters

27 Copyright © 2000 by Monica Yuskaitis What is the area of this parallelogram? base 6 ft. height 5 ft. 5 6 x 30ft. 2 You say: 30 square feet.

28 Copyright © 2000 by Monica Yuskaitis What is the area of this parallelogram? base 5 m. height 10 m x 50m. 2 You say: 50 square meters.


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