9-3 - 3 squares are about half full when two are put...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Perimeters and Areas of Rectangles Lesson 9-3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Area Area is the amount of space inside a figure. We use square units to describe area. For rectangles, the area formula is A=lw (area equals length times width). For squares, the formula is still A=lw. However, since every side of a square is the same, then it can also be expressed as A=s 2 where s equals the length of one side.
Background image of page 2
Example 12 m 8 m A=lw A=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 m 2 .
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Area of Irregular Shapes Count how many squares are completely covered by the shape. Put partial squares together to make wholes. 13 squares are full. 2 squares are almost full, and they can be matched up with 2 squares that are almost empty.
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3 squares are about half full when two are put together that makes a full square. The half square is left over. Altogether, there are 16 and a half squares full. Perimeter Perimeter is the distance around the outside of a figure. The perimeter of a rectangle is derived by adding all four sides. Since the two lengths are equal, and the two widths are equal, then it can be written as P = 2l + 2w. 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. Example 18 cm 18 cm 5 cm 5 cm P = 2w + 2l P = 2(5) + 2(18) P = 10 + 36 P = 46 cm Perimeter results in regular units, not square units. Homework Time...
View Full Document

Page1 / 7

9-3 - 3 squares are about half full when two are put...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online