3Thavo CH6 SUMMARY p.224-227

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• Leerjaar 3

Ch 6 SUMMARY, p.224-227

The Summary -as usual- gives you:

+ fine explanations 

+ a few exercises to practice 

Before you start on the SUMMARY...

+  we will discuss:

+ how to calculate a line segment in a cuboid once more

+ for this we'll do:   exercise 35, §6.6 Angles in solids

Question about 35a :

 In what Cross-section will we calculate angle MKR?

Answer this in the next slide! (find the best answer)

And the Cross-section is.....

1. KLRS
2. KQRN
3. MKRP
4. MKPR

In order to find angle MKR,

we first have to

+ calculate line segment ......   

+ in Cross-section .....

Fill in both answers in the next slide!

Line segment ....., and
Cross-section ..... .

1. MR, MNSR
2. MK, KMRP
3. KR, KMRP
4. MK, MKR

Option C: Why calculating KR?

That is more difficult and more work than calculating KM!

It is MK you need to know. Then in MKPR you can calculate

angle MKR.

See next slide! 

A sketch of KMRP, and

the calculation of KM.

Question: What do we finally need to do?

Answer this in the next slide!

The last step to take is: .......

Answer: use the Tangent of angle MKR! As follows:

Finally 35b!

Finding a Cross-section now will not be easy, but ...

maybe you have another bright idea?! Fill this in in the next slide!

How to find angle KSM ?
(answer next slide)

IN the next slide you see the results.

Homework time

You know why? See next slide.