This lesson contains 15 slides, with interactive quiz and text slides.
Lesson duration is: 45 min
Items in this lesson
Last week
- Quantities and units
- Units of length
- Converting units
- Scale
CHAPTER 9: Measuring
Slide 1 - Slide
Today, you will learn ...
... 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.
CHAPTER 9: Measuring
Slide 2 - Slide
AREA
PERIMETER
8 ha
(=8hm²)
??
2.8km
??
Slide 3 - Slide
The perimeter of a shape is the total length of the edges.
40+22+20+40+31 = 153 cm
Slide 4 - Slide
Area is about how much space is covered.
The area of a shape is how many times the unit of area fits onto it.
Slide 5 - Slide
Units of area
Slide 6 - Slide
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
Slide 7 - Slide
Area of a rectangle
1
2
Slide 8 - Slide
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.
timer
5:00
finished?
> exercises 17c,d, 18
Slide 9 - Slide
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.
Slide 10 - Open question
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.