2TH/vwo §8.2 Parallelograms

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

§8.2 Parallelograms

Learning goal:

how to calculate the area of a parallelogram

Homework: 

§8.2  not 8, and 11

but also:      choose one Support exercise (S10 or S13) 

                        OR one Challenge exercise (C3 or C4) !

Let's do this task together!

Let's do this task together!

Solution:   6 cm wide and 3 cm high

Think this out.

Answer in next slide.

SOLUTION:

3 cm high and 6 cm wide

Let's do this task together!

ANS

answer is ....

cm​2​​

Solution:   A = 6 x 3 = 

18cm​2​​

Let's do this task together!

Solution:  The part she took off from the parallelogram she put back too!

Let's do this task together!

Solution:    6 x 3 = 

18cm​2​​

Note:

The height can be OUTSIDE the parallelogram!

Just like we saw in §8.1 with triangles.

2 Notes about this task:

a.   PS = 70 (so the whole side)

b.   About the picture on the right. The task is to find the AREA.

       You can work with: base = UV = 5.   and height WY = ..... ?!

How to find WY?

ANS !

I can find length WY by ......

But how to use 

Pythagoras in exercise 10?!

See next slide! We will see how it works in THIS situation.

Homework time

Homework: 

§8.2   

You may skip: 8, 9 and 11.

So do:   10, 12, 13 and 14   and choose 

                 one task from S10 + S13.      OR

                 one task from C3 + C4