Embed Size (px)
Citation preview
Quadrilaterals II
by Monica Yuskaitis
Copyright © 2000 by Monica Yuskaitis
Quadrilateral Family
parallelogramrectangle
rhombus square
trapezoid
Copyright © 2000 by Monica Yuskaitis
Definition• Perimeter – (P) The distance
around a figure.
5 in. 5 in.
9 in.
9 in.
5959+
28 in.
Copyright © 2000 by Monica Yuskaitis
Find the perimeter
9 cm. 9 cm.
9 cm.
9 cm.
9999+
36 cm.A shortcut for the square is 4 x side.
Copyright © 2000 by Monica Yuskaitis
Find the perimeter
9 cm. 9 cm.
7 cm.
7 cm.
9797+
36 cm.
Copyright © 2000 by Monica Yuskaitis
Find the perimeter
10 ft. 10 ft.
10 ft.
6 ft.
106
1010+
36 ft.
Copyright © 2000 by Monica Yuskaitis
Find the perimeter
12 m. 15 m.
18 m.
11 m.
12111518+56 m.
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.
Copyright © 2000 by Monica Yuskaitis
How to find the area of a squareor rectangle.
3 cm.
5 cm.
Step 1 – Multiply the length times the width. (A = l x w)
53x
15
Copyright © 2000 by Monica Yuskaitis
How to find the area of a squareor 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.
53x
15 cm.2
Copyright © 2000 by Monica Yuskaitis
How to find the area of a squareor rectangle.
3 cm.
5 cm.
Step 3 – Read the answer: 15 squarecentimeters.
53x
15 cm.2
Copyright © 2000 by Monica Yuskaitis
What is the area?
5 ft.
6 ft.
56x
30 ft.2
You say: 30 square feet.
Copyright © 2000 by Monica Yuskaitis
What is the area?
2 in.
6 in.
26x
12 in.2
You say: 12 square inches.
Copyright © 2000 by Monica Yuskaitis
What is the area?
4 m.
7 m.
74x
28 m.2
You say: 28 square meters.
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
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)
1317x90º
17 in.
13 in.1
2
931+
221
Copyright © 2000 by Monica Yuskaitis
How to find the area of a parallelogram
height
base
Step 2 – Indicate that the answer is insquare inches by writing the exponent2 after the unit of measure. 13
17x
90º
17 in.
13 in. 1931+
221 in. 2
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,90º
height2 cm.
4 x 2 = 8 cm.2
First find the area.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,
90º
height2 cm.
4 x 2 = 8 cm.2
Cut off the piece at the dotted line.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,
90º
height2 cm.
4 x 2 = 8 cm.2
Cut off the piece at the dotted line.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,
90º
height2 cm.
4 x 2 = 8 cm.2
Move this piece to the other side.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,
90º
height2 cm.
4 x 2 = 8 cm.2
Move this piece to the other side.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
base 4 cm,
90º
height2 cm.
4 x 2 = 8 cm.2
Now you have a rectangle 4 x 2 cm.
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
length 4 cm,
width2 cm.
4 x 2 = 8 cm.2
What is the area of this rectangle?
Copyright © 2000 by Monica Yuskaitis
How to check the area of a parallelogram
length 4 cm,
width2 cm.
4 x 2 = 8 cm.2
That’s right! 8 cm2 The same as the parallelogram.
Copyright © 2000 by Monica Yuskaitis
What is the area of this parallelogram?
base 7 cm.
height 5 cm. 57x
35 cm.2
You say: 35 square centimeters
Copyright © 2000 by Monica Yuskaitis
What is the area of this parallelogram?
base 6 ft.
height 5 ft.
56x
30 ft.2
You say: 30 square feet.
Copyright © 2000 by Monica Yuskaitis
What is the area of this parallelogram?
base 5 m.
height 10 m.
105x
50 m.2
You say: 50 square meters.
