'Measuring'

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

Last week

- Quantities and units

- Units of length

- Converting units

- Scale

Measuring

We know:

... what an area is and what perimeter is.
... different units of area.

... how to convert units of area.

... how to calculate the area of a rectangle.

Measuring

AREA

PERIMETER

8 ha

(=8hm²)

??

2.8km

??

The perimeter of a shape is the total length of the edges.

40+22+20+40+31 = 153 cm

Area is about how much space is covered.

The area of a shape is how many times the unit of area fits onto it.

Units of area

Units of area

80 dm² = ... m²

80 dm² = 0.8m²

4.5 m² = ... cm²

4.5 m² = 450 dm²

4.5 m² = 45,000 cm²

Area of a rectangle 

1

2

Area of a rectangle 

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.

 finished?

> exercises 17c,d, 18

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.
b) Calculate the perimeter and the area of a square with sides measuring 5 m.

Area of a rectangle 

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.

Perimeter  7+4+7+4= 22 cm

Area    7x4 = 28 cm²

Perimeter  5+5+5+5= 20 m

Area    5x5 = 25 m²

Start making exercises 9-22

Today, we have learned ...?

• Tomorrow: mandatory!
  
• Exercises 9-22
  
• Next week (tuesday): QUIZ
• 9th of June: TEST

QUIZ 9.1/9.2

• Quantity, unit
• Units of length
• Converting units of length
• Scale

• Perimeter
  
• Area
  
• Units of area
  
• Converting units of area
  
• Area of a rectangle