2TH Ch6 REFRESH

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Ch6 Pythagoras' theorem

REFRESH, p.206/207 = Homework today

Let's have a look at a few Math words.

Answer the following questions!

What is a cuboid?

1. a cube
2. a rectangle
3. a 3D object with 6 sides and only right angles
4. a quadrilateral

Explain face, edge and vertex in the right order:

1. hoekpunt, vlak, rand
2. aangezicht, rand, hoekpunt
3. zijde, ribbe, hoekpunt
4. zijde, hoekpunt, ribbe

What kind of triangle is this?

ANS 

What is the name of this triangle:

1. an isosceles triangle
2. an equilateral triangle
3. a right-angled triangle
4. a terrible triangle

Homework time!

Do REFRESH p.206/207 now.

Later some more slides come up.

What is the length of a side of a square with area
121 squared cm ?

Solution:

A square with area 121 

is 11 cm, because 11 x 11 = 121

cm​2​​

What is the length of a side of a square with an area of 15 squared centimetres ?

√​15​​​

√​15​​​

√​15​​​

1. root 15
2. 60
3. 15 : 4 = 4.75
4. square root 15

Solution:

If this square has 15          ,

the lengths of the sides are                 cm.

cm​2​​

√​15​​​

Squaring:

= 5 x 5 = 25

= c x c ,    but now:

=   .....

ANS

5​2​​

c​2​​

(√​10​​​)​2​​

(√​10​​​)​2​​

= .......

Solution:

   =                            x                       =   10

(√​10​​​)​2​​

√​10​​​

√​10​​​

Let's go a little further:

   =                            x                       = 10

Now also in this way goes:

=                      x                      =

4 x 4 x            x                = 16 x 6 =    96

(√​10​​​)​2​​

√​10​​​

√​10​​​

(4√​6​​​)​2​​

4√​6​​​

4√​6​​​

√​6​​​

√​6​​​

Do R8 in the same way!

Look at this example:

Homework time again!

Make sure you finish most of it in this lesson!