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Transcript
```Geometry
Holt 4.4
Page 242
Notes 2.10B
Recall from yesterday the two conjectures that you derived about the SSS triangle congruence shortcut
and the SAS triangle congruence shortcut.
SSS Conjecture:
SAS Conjecture:
Example:
1. Use SSS to explain why  PQR   PSR
***Remember: The Reflexive Property of Congruence was covered in Chapter 2 page 106.
An included angle is________________________________________________________.
In order for the SAS Conjecture to be valid, the angle chosen MUST be the one included between the two
chosen sides! Not just any old angle will work!
Examples:
2. The diagram shows part of the support structure for a tower.
Use SAS to explain why  XYZ   VWZ.
***Remember: Vertical Angles are congruent was covered in Chp. 1& 2 pages 30 and 120.
3. Show that the triangles are congruent for the given value of the variable.
 UVW   YXW, x = 3
Page 244
Example 3A
You try….
Page 244
Example 3B
4.  DEF   JGH, y = 7
5.  STU   VWX, when y = 4
UT = y + 3
m  T = 20 y + 12
ST = 2y + 3
UT = 4 + 3
m  T = 20(4) + 12
ST = 2(4) + 3
UT = 7
m  T = 80 + 12
ST = 8 + 3
m  T = 920
ST = 11
T  W
ST  VW
UT  WX
So STU  VWX by SAS
6.
** Page 244
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