# Triangle theorems

Bach theorem
Altitude theorem
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Slide 1: Tekstslide
WiskundeMiddelbare schoolvwoLeerjaar 2

In deze les zitten 11 slides, met interactieve quizzen en tekstslides.

Lesduur is: 60 min

## Onderdelen in deze les

Bach theorem
Altitude theorem

#### Slide 1 -Tekstslide

Sketch triangle ABC with:
B=90
AB=9cm
BC=40cm

#### Slide 2 -Open vraag

Calculate AC in the triangle sketched in previous question.

#### Slide 3 -Open vraag

The area theorem
In a right-angled triangle, the product
of the 2 right-angled legs is equal to
the product of the hypothenuse and
its matching heigth.

#### Slide 4 -Tekstslide

Draw 2 different right-angled triangles and draw in al these triangles the matching height to the hypothenuse

#### Slide 6 -Tekstslide

Calculate BE, round to 1 decimal

#### Slide 7 -Open vraag

The altitude theorem
If the altitude (height) h of an
right-angled triangle splits the
hypothenuse in parts p and q,
then:

h2=pq

#### Slide 8 -Tekstslide

Lets proof this one together

#### Slide 9 -Tekstslide

Thales' Theorem
If A, B and C are on the circle
and AB is the diameter,
then triangle ABC is a
right-angled triangle with
C=90

THE END