1. Polygons whose corresponding angles are congruent and
corresponding sides are proportional.
The ratio of the lengths of two corresponding sides
If the SF > 1 then it's an enlargement.
If 1 > SF > 0 then it's a reduction. AB DE = 3 6 1 2

2. D E F 10 15 2 3 8 12 18 AB DE BC EF CA FD
∠P ≅ ∠X, ∠Q ≅ ∠Y, ∠R ≅ ∠Z PQ XY QR YZ RP ZX =

3. L M K A J
A J
congruent 8 14 4 7 12 21
proportional
JKLM 4 7

4. proportional CD RS 13 24
312 26

5. 4/5 15 12 40 x =
15x = 480
x = 32

6. NK SP MN RS LM QR KL PQ

7. 20 16 5 4
2(20) + 2(25)
2l + 2w = P 5 4 72

8. scale factor

9. JK
8 + 8
5 + 5 16 10 8 5 8 5 8 5 14
22.4 14 40 72 = 5 9
Scale Factor
P∆WXY =
( )
=120
Scale Factor 16 24 = 2 3
QS =
(39)
= 26