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1819 C2X §4.3
Which exercises/theories should I discuss on the board?
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Slide 1:
Mind map
Wiskunde
Middelbare school
havo, vwo
Leerjaar 2
This lesson contains
10 slides
, with
interactive quiz
and
text slides
.
Lesson duration is:
50 min
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Items in this lesson
Which exercises/theories should I discuss on the board?
Slide 1 - Mind map
Similar figures
If two figures are enlargements of each other, we say they are
similar figures
.
In similar figures you have pairs of
corresponding angles
and pairs of
corresponding sides
.
Slide 2 - Slide
Similar figures
Slide 3 - Slide
Are two figures similar?
To find out if two figures are similar, you have to check:
- are all corresponding angles equal?
- are all corresponding sides multiplied with the same scale factor?
If
both
are true, then the figures are similar.
Slide 4 - Slide
Are two figures similar? NOTATION!
1) Check if the corresponding angles are equal:
- Calculate missing angles if needed
- List all pairs of corresponding angles
- If all pairs are equal, move on to step 2. If all pairs are not equal the figures are NOT similar.
Slide 5 - Slide
Are two figures similar? NOTATION!
2) Check if the corresponding sides are multiplied with the same scale factor.
- List all pairs of corresponding sides (in a table)
- Calculate the scale factor for each pair
- If the scale factor is equal for each pair, the figures are similar. If the scale factor is NOT equal for each pair, the figures are NOT similar.
Slide 6 - Slide
Are two figures similar? NOTATION!
1) Check if the corresponding angles are equal:
The angles are not equal
therefore ABC and KLM are
NOT similar.
(Step 2 is no longer needed)
Slide 7 - Slide
Are two figures similar? NOTATION
So all corresponding
angles are equal.
Slide 8 - Slide
Are two figures similar? NOTATION
All sides are NOT
multiplied with the
same factor.
ABCD and EFGH are
NOT similar.
Slide 9 - Slide
HW Monday
Make exercises §4.3:
Support: 17, 18, 19, S20, S21, 22, 23
Standard: 17, 18, 19, 20, 21, 22, 23
Challenge: 17, 18, 19, 20, 21, 22, C4
Correct with a red pen
Slide 10 - Slide
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