mensuration objective perimeter and area of shapes made from triangles and rectangles
TRANSCRIPT
![Page 1: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/1.jpg)
Mensuration
ObjectivePerimeter and area of shapes made
from triangles and rectangles
![Page 2: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/2.jpg)
Does anybody know what perimeter is?The perimeter of a shape is all the way around the shape.
3cm
3cm
3cm
3cm
Perimeter =3+3+3+3 = 12cm
Pick a starting point!
Don’t forget units!
![Page 3: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/3.jpg)
On your white boards find the perimeter of
these shapes…
![Page 4: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/4.jpg)
8cm
![Page 5: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/5.jpg)
16cm
![Page 6: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/6.jpg)
12cm
![Page 7: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/7.jpg)
10m
10m
4m4m
28m
![Page 8: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/8.jpg)
8m
10m
5m
2m
3m
8m
5m
51m
![Page 9: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/9.jpg)
4mm
10mm
5mm
6mm
42mm
![Page 10: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/10.jpg)
Does anybody know what area is?
Area is the amount of space inside a shape.
Area of a rectangle
length
width
Area of a rectangle = length x width
ExampleFind the area of this rectangle
5cm
3cm
Area = length x widthArea = 5cm x 3cmArea = 15cm²
Don’t forget the correct units!
![Page 11: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/11.jpg)
On your white boards find the area of these
rectangles…
![Page 12: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/12.jpg)
10cm6
cm
60cm²
![Page 13: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/13.jpg)
2mm
12
mm
24mm²
![Page 14: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/14.jpg)
23km
2k
m
46km²
![Page 15: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/15.jpg)
2m8
2cm
1.64m² or 16400cm²
![Page 16: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/16.jpg)
Area of a triangle
Length
Heig
ht
---------------------------------------------------------------
Area = length x height_____________ 2
ExampleFind the area of this triangle
5c
m
8cm
Area = length x height
_____________ 2
Area = 8cm x 5cm__________ 2
Area = 20cm²
![Page 17: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/17.jpg)
On your white boards find the area of these
triangles…
![Page 18: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/18.jpg)
10
m
10m
50m²
![Page 19: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/19.jpg)
6m
9m
27m²
![Page 20: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/20.jpg)
3km
5km
Perpendicular height
7.5km²
![Page 21: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/21.jpg)
10m
m 8m
m
9mm
8m
m
36mm²
![Page 22: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/22.jpg)
Could you find the area of this shape?
10cm
12
cm
5cm
6cm
30cm²
4cm
48cm²
Area = 30cm² + 48cm²Area = 78cm²
![Page 23: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles](https://reader035.vdocument.in/reader035/viewer/2022062315/5697bf9a1a28abf838c91f66/html5/thumbnails/23.jpg)
10m
14m
5m
Could you find the area of this shape?
50m²
4m5
m 10m²
Area = 50m² + 10m²Area = 60m²