Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

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Mensuration Objective Perimeter and area of shapes made from triangles and rectangles

Transcript of Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

Page 1: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

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.

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.

On your white boards find the perimeter of

these shapes…

Page 4: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

8cm

Page 5: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

16cm

Page 6: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

12cm

Page 7: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

10m

10m

4m4m

28m

Page 8: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

8m

10m

5m

2m

3m

8m

5m

51m

Page 9: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

4mm

10mm

5mm

6mm

42mm

Page 10: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

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.

On your white boards find the area of these

rectangles…

Page 12: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

10cm6

cm

60cm²

Page 13: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

2mm

12

mm

24mm²

Page 14: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

23km

2k

m

46km²

Page 15: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

2m8

2cm

1.64m² or 16400cm²

Page 16: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

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.

On your white boards find the area of these

triangles…

Page 18: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

10

m

10m

50m²

Page 19: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

6m

9m

27m²

Page 20: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

3km

5km

Perpendicular height

7.5km²

Page 21: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

10m

m 8m

m

9mm

8m

m

36mm²

Page 22: Mensuration Objective Perimeter and area of shapes made from triangles and rectangles.

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.

10m

14m

5m

Could you find the area of this shape?

50m²

4m5

m 10m²

Area = 50m² + 10m²Area = 60m²


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