1TH/vwo §10.3 Enclosing areas

§10.3 Enclosing areas
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§10.3 Enclosing areas

Slide 1 - Diapositive

This time start yourself:
+ make the first tasks of §11.3, so start with
   exercise 17, etcetera
+ later this Lessonup is continued!

Slide 2 - Diapositive

Slide 3 - Diapositive

Give your answers for a and b only in the next slide!
So key in two numbers.
timer
0:30

Slide 4 - Diapositive

area A and area B are .... and ....

Slide 5 - Carte mentale

Solutions:
a. area rectangle around A is  4 x 4 = 16 grid squares
    area triangle A = 1/2 x 16 = 8
b. area rectangle around B is 5 x 3 = 15
     area triangle B = 1/2 x 15 = 7.5 

Slide 6 - Diapositive

Now answer c in the next slide.
Key in only the two numbers.
timer
1:00

Slide 7 - Diapositive


A
2 and 7.5
B
2 and 1.75
C
2 and 1.875
D
2 and 2

Slide 8 - Quiz

Solution:

Slide 9 - Diapositive

Further explanation area B:
7          x   0.25 =       

                   =    1             = 1.875                      How does this work?!

Use this:    
21
21541=
815
87
cm2
41=0.25
81=0.125
87=0.875
81=0.125

Slide 10 - Diapositive

Slide 11 - Diapositive

FOTOVRAAG:
+ Make 20 a, b and c in your Notebook now.
+ Take a pic of your work and
+ Send it in in the next slide!

Slide 12 - Diapositive

20 a, b,c

Slide 13 - Question ouverte

Solutions:

Slide 14 - Diapositive

Is it always a triangle, the area you have to calculate?
Answer: no.
Next slides show you other shapes too!
 

Slide 15 - Diapositive

In this exercise you see:
- al kinds of forms
- even a form with a part in the middle taken out!
   (in the two last cases the white part has to be calculated and 
   subtracted)
- now follows the general way to tackle these tasks

Slide 16 - Diapositive

Slide 17 - Diapositive

When doing this task,
+ use the 4 step we saw in the last slide.
+ give a complete calculation instead of only the answer

Slide 18 - Diapositive

Homework:
Make the tasks from:
17 t/m 22 that you didn't do yet
as always, check your work and send it in in GC

Slide 19 - Diapositive