1TTO §4.6 Constructing figures PTI

Welcome in this Lessonup!

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This lesson contains 19 slides, with text slides.

Lesson duration is: 50 min

Items in this lesson

Welcome in this Lessonup!

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First we look back at §4.5 Drawing angles.

This was a Homework task for today!

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Suppose you had NO CLUE HOW to do it.

Then you should Study the Theory on the previous page! In the

next slides you see this and an Example.

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Take from your bag:

- Textbook + Notebook

- pencil + pen

- Compasses + Geo

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Think about question41b, below!

In the next slide there's the answer to this question.

timer

1:00

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Answer:

Because we don't know the ANGLES!

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Because we don't know any angles, we have to use our COMPASSES, and the GEO too, of course.

By the way, you have already been working with the COMPASSES in a similar situation.

Just look at exercise 16, next slide!

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In order to find out where the ship in trouble cloud be, we drew

two CIRCLES with our COMPASSES. The points of intersection where the places the ship could be! See next slide.

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In a similar way as in the Map you just saw, we will make a triangle

when only the three LENGTHS and NO ANGLES are given!

Let's Study the Theory of §4.6 CONSTRUCTING ANGLES now!

Pay good attention, because we are going to

carry it out, soon!

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Time to do a Homework exercise!

- Open your Notebook and Textbook

- Get yourself a Pencil, Compasses and a Geo.

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3:00

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Homework time

Do: §4.6 Constructing figures

Remember:

1st 'Constructing' always means: using the COMPASSES!

2nd Leave the arcs in your construction!

Ready: 1. correct 2. check your work with the Solutionsbook

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