1819 C2X Extra Lesson

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 2

What shall we do today & Tuesday?
(in all cases, HW for after WFweek is §8.R and §8.1)

1. Today: only ch11 questions Monday: test CH11 Tuesday: §8.R & §8.1
2. Today: §8.R and ch11 questions Monday: Test Ch11 Tuesday: §8.1
3. Today: only §8.R Monday: test CH11 Tuesday: §8.1
4. No preference

What questions do you have about CH11?

What number should be written on the dots?
1.25 km = .... m

What number should be written on the dots?

50cm​2​​=...mm​2​​

Converting units of length and area

Units of length are multiplied/divided with steps of 10

Units of area are multiplied/divided with steps of 100

Enclosing figures (R3g)

Calculate the area of figures ABCD, KLM and PQR by enclosing.

When enclosing a figure, you use the fact that the area of a right-angled triangle is half a rectangle.

Enclosing figures (R3g)

Calculate the area of figures ABCD, KLM and PQR by enclosing

Area ABCD:

Area red square = 

Area triangles on outside =

Area ABCD = 

4⋅4=16

​2​​3⋅1​​=1.5

16−4⋅1.5=10

Pythagoras' theorem

If you know two sides of a right angled triangle, you can calculate the third side using Pythagoras' Theorem:

Pythagoras' theorem

Calculate the lenght of side AC in triangle ABC, where BC = 13, AB = 5 and angle A is 90°

Pythagoras' theorem

Calculate the lenght of side AC in triangle ABC, where BC = 13, AB = 5 and angle A is 90°

Pythagoras' theorem

Calculate the lenght of side AC in triangle ABC, where BC = 13, AB = 5 and angle A is 90°

Pythagoras' theorem

Calculate the lenght of side AC in triangle ABC, where BC = 13, AB = 5 and angle A is 90°

HW Tuesday 11-6

Make and correct §8.Refresh and §8.1

What questions do you have about CH11?