Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other...
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Transcript of Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other...
![Page 1: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/1.jpg)
Finding AreaPart 1: Rectangles
Math 6
![Page 2: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/2.jpg)
Objectives:
1. Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing into rectangles or decomposing into triangles and other shapes.
6.G.1
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Keys to Geometry
Master the vocabulary1. Polygon
2. Parallel
3. Perimeter
4. Perpendicular
5. Area
6. Rectangle
7. Right angle
8. Line segments
![Page 4: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/4.jpg)
Online Math Dictionaries
http://www.mathsisfun.com/definitions/letter-a.html
http://www.icoachmath.com/math_dictionary/mathdictionarymain.html#P
http://my.hrw.com/math06_07/nsmedia/tools/glossary/msm/glossary.html
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What is area? The size of a surface.
The amount of space inside the boundary of a plane (2-dimensional) figure such as a triangle or circle.
![Page 6: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/6.jpg)
How is area found?
There are different methods for finding area depending on what type of polygon you are working with…
This lesson will cover area of rectangles
![Page 7: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/7.jpg)
Rectangle• A 4-sided plane figure • whose sides are formed by line
segments• With all right angles (90°).• Opposite sides are parallel and of
equal length.
Example: A square is a special type of rectangle.
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Area of a rectangle (or square)
Use the dimensions of the figure that are known.
Multiply the length by the width.
![Page 9: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/9.jpg)
Find the area of the rectangle below:
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Why is the answer expressed as “square units.”
• Area is the outcome of multiplication of two lengths. 7cm x 14cm.
• So cm multiplied by cm = cm².
• The answer must indicate “squared” either by use of an exponent ‘2’ or the word squared or abbreviation ‘sq’.
![Page 11: Finding Area Part 1: Rectangles Math 6. Objectives: 1.Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing.](https://reader036.fdocuments.us/reader036/viewer/2022082505/56649dda5503460f94ad081f/html5/thumbnails/11.jpg)
How is area different from perimeter?
Area is the amount of surface that a figure covers. (INSIDE)
Perimeter is the distance around the outside of a figure. (OUTSIDE)
Since perimeter is a linear measure, not a spatial one, the answer is not in “square units.”
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Guided Practice
Find the area of the rectangle below:
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Guided Practice
Find the area of a rectangle whose dimensions are:
Length: 12 feet
Width: 15 feet
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Guided Practice
A gardener digs a flower bed that is 8 meters long and half a meter wide. What is the area of the flower bed?
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Guided Practice
A rectangle is twice as long as it is wide. Its width is 5½ cm. Find the area of the rectangle.
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Guided Practice
The label on a tin of paint states that it contains enough paint to cover 10m². I need to paint a wall that measures 2 meters by 4½ meters. Will I have enough paint?
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Conclusion
To find the area of a rectangle, we use the most basic formula:
Area = length times width.
A=L x W
This is the starting point for finding area of many other figures.
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Assignments
http://mrnussbaum.com/grade5standards/575-2/