1. lesson 19.notebook September 25, 2012
Assignment:
1­­>Set 20 (evens) ­ Due Friday (9/28)
2­­>Test #2 ­ Tuesday (10/2)
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2. lesson 19.notebook September 25, 2012
Lesson 19 Warm­Up:
1) The formula for the area of a parallelogram is
A = bh. Find A when b = 7 mm and h = 9 mm.
2) Simplify: 125
3) What is the mean of the prime numbers between 10 and 20?
4) Sy swam one kilometer in 40 minutes. The length of the
pool was 25 meters. About how long did it take Sy to swim the
length?
5) Using prime factorization, reduce: 375
1000
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3. lesson 19.notebook September 25, 2012
Lesson 19:
*polygon­­>closed plane figures with straight sides
*regular polygon­­>a polygon with all sides equal and all angles equal
*congruent­­>figures that are the same shape AND the same size
*similar­­>figures that are the same shape...but not necessarily the
same size
*dilation­­>an enlargement of a figure
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4. lesson 19.notebook September 25, 2012
Examples ­ Lesson 19
pg. 123
A) hexagon, irregular
B) C
C) octagon
D) dodecagon
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5. lesson 19.notebook September 25, 2012
E) ABEF AFEB
F) triangle B
G) A, B, and D ­ similar; B and D ­ congruent
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