2. Proving Δs are  : SSS and SAS

3. Side-Side-Side (SSS)  Postulate
If 3 sides of one Δ are  to 3 sides of another Δ, then the Δs are .

4. A
Meaning:
___
___
If seg AB  seg ED, seg AC  seg EF & seg BC  seg DF, then ΔABC  ΔEDF. B C
___ E
___
___ D
___ F

5. Given: seg QR  seg UT, RS  TS, QS=10, US=10 Prove: ΔQRS  ΔUTS

6. Proof Statements Reasons 1. 1. given 2. QS=US 2. subst. prop. =
3. Seg QS  seg US Def of  segs.
4. Δ QRS  Δ UTS SSS post

7. Side-Angle-Side Postulate (SAS)
If 2 sides and the included  of one Δ are  to 2 sides and the included  of another Δ, then the 2 Δs are .

8. If seg BC  seg YX, seg AC  seg ZX, and C  X, then ΔABC  ΔZXY.) ( C A X Z

9. Given: seg WX  seg. XY, seg VX  seg ZX, Prove: Δ VXW  Δ ZXY1 2 Y V

10. Proof Statements Reasons 1. seg WX  seg. XY 1. given seg. VX  seg ZX
2. 1   vert s thm
3. Δ VXW  Δ ZXY SAS post

11. Given: seg RS  seg RQ and seg ST  seg QT Prove: Δ QRT  Δ SRT.

12. Proof Statements Reasons 1. Seg RS  seg RQ 1. Given seg ST  seg QT
2. Seg RT  seg RT 2. Reflex prop 
3. Δ QRT  Δ SRT 3. SSS post

13. Given: seg DR  seg AG and seg AR  seg GR Prove: Δ DRA  Δ DRG.

14. Proof Statements seg DR  seg AG Seg AR  seg GR 2. seg DR  Seg DR
3.DRG & DRA are rt. s
4.DRG   DRA
5. Δ DRG  Δ DRA
Reasons
Given
reflex. Prop of 
 lines form 4 rt. s
4. Rt. s thm
5. SAS post.