Task: Task: Jane wants to install new carpet in her living room. The room length is Jane wants to install new carpet in her living room. The room length is 20ft. and the width is 20 ft. How much carpet will she need to cover the 20ft. and the width is 20 ft. How much carpet will she need to cover the living room floor? How much molding will she need to go around the living room floor? How much molding will she need to go around the living room?living room?

Answer Sentence:Answer Sentence:

January 27, 2012•Get out homework.•Write down the following on your paper that is on your desk.

•M6M2. Students will use appropriate units of measure for finding length, perimeter, area and volume and will express each quantity using the appropriate unit.a. Measure length to the nearest half, fourth, eighth and sixteenth of an inch.b. Select and use units of appropriate size and type to measure length, perimeter, area and volume.c. Compare and contrast units of measure for perimeter, area, and volume.

E.Q.: What is the difference between area and perimeter?

Perimeters and Areas of Perimeters and Areas of RectanglesRectangles

AreaAreaArea is the amount of space inside

a figure. We use square units to describe area.

For rectangles, the area formula is A=bh (area equals base times height).

For squares, the formula is still A=bh. However, since every side of a square is the same, then it can also be expressed as A=s2 where s equals the length of one side.

ExampleExample

12 m

8 m A=bhA=12(8)A=96 sq. m

Area is expressed in square units. It can be written (in this case) as 96 sq. m or 96 m2.

PerimeterPerimeterPerimeter is the distance around the

outside of a figure.The perimeter of a rectangle is

derived by adding all four sides. Since the two bases are equal, and the two lengths are equal, then it can be written as P = 2b + 2h.

For squares, the perimeter is found the same way (add all 4 sides). Since all sides are the same, however, you can use the formula P = 4s.

ExampleExample

18 cm

18 cm

5 cm 5 cm

P = 2b + 2hP = 2(5) + 2(18)P = 10 + 36P = 46 cm

Perimeter results in regular units, not square units.

Homework TimeHomework Time