PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.
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Transcript of PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.
![Page 1: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/1.jpg)
PERIMETER
![Page 2: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/2.jpg)
Definition•Add up all sides of the object
25
P = 2 + 2 + 5 + 5
P = 14
![Page 3: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/3.jpg)
Example
3cm
6cm
5cm
3+6+5 P = 14
5cm
2cm
2cm
5cm
2+2+5+5 P = 14
![Page 4: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/4.jpg)
Now…You!!
![Page 5: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/5.jpg)
Area of rectangles
Area is the space inside a
2D shape.
![Page 6: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/6.jpg)
How do we calculate area?
• Measure the length.• Measure the width.• Multiply the length X width to calculate
the area!
![Page 7: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/7.jpg)
![Page 8: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/8.jpg)
But what if you want to calculate the area of an
irregular shape?• What if the shape has more than 4 sides?
• How can you do?
Length X Width
when there isn’t a length and there isn’t a width?
![Page 9: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/9.jpg)
YOU HAVE TO MAKE RECTANGLES!
• Look at this shape. How could you calculate the area?
10cm
6cm6cm
4cm
![Page 10: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/10.jpg)
You have to create more than one rectangle.
• Like this!
10cm
6cm
6cm
4cm
4cm
A = 6cm X 4cm = 24cm2
B = 6cm X 4cm = 24cm2
A + B = Area
24cm2 + 24cm2 = 48cm2
A
B
![Page 11: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/11.jpg)
So to calculate the area of an irregular shape
•Split the shape into at least two rectangles.
•Calculate the area of each one.
•Add the two together.•You’re done!
![Page 12: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/12.jpg)
Area of Squares
Side 3cm
3cm. Side
A square has all sides the same length.
Therefore, we do not need a length and a width. We can simply call them sides.
The area of a square can be calculated by multiplying side by side…
or side squared.
![Page 13: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/13.jpg)
Area of a square is given by:
A = a 2
• where a = length of side
![Page 14: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/14.jpg)
![Page 15: PERIMETER Definition Add up all sides of the object 2 5 P = 2 + 2 + 5 + 5 P = 14.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f2f5503460f94c496e3/html5/thumbnails/15.jpg)
Great job!