# 1819 H2Y §8.Refresh

What number should be written on the dots?
1.25 km = .... m
1 / 13
Slide 1: Open question
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 13 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

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

#### Slide 1 -Open question

What number should be written on the dots?

50cm2=...mm2

#### Slide 2 -Open question

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

#### Slide 3 -Slide

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.

#### Slide 4 -Slide

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 =
44=16
231=1.5
1641.5=10

#### Slide 5 -Slide

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

#### Slide 6 -Slide

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

#### Slide 7 -Slide

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

#### Slide 8 -Slide

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

#### Slide 9 -Slide

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

#### Slide 10 -Slide

HW Tuesday 11-6
Make and correct §8.Refresh

#### Slide 11 -Slide

Which exercises/theories from CH11 should we discuss on the board?

#### Slide 12 -Mind map

HW Friday
Prepare any questions you have on CH11,
work on Practice Test CH11