2TH §8.2 Parallelograms

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

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§8.2 Parallelograms

Learning goal:

how to calculate the area of a parallelogram

Homework: 

§8.2  Do Exercises 10, S10, 12, 13, S14

                     

Let's do this task together!

Let's do this task together!

Solution:   6 cm wide and 3 cm high

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:

PS = 70 (so the whole side)

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 Do exercises 10, S10, 12, 13, S14

Check your answers with the solutions book.

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