L. \_\_\_\_\_ \_\_\_\_\_. J. N. K. M. CPCTC. Be able to use CPCTC to find unknowns in congruent triangles!. Quick Review. Are these triangles congruent? By which postulate/theorem?. Oh, and what is the Reflexive Property again?.
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Are the triangles congruent? By which postulate or theorem?
What other parts of the triangles are congruent by CPCTC?
If B = 3x and Y = 5x –9, find x.
3x = 5x - 9
9 = 2x
1. 1. ___________
3. 3. ___________
2. _______________ 2. Reflexive
4. _______________ 4. ___________
1. _____________________ 1. Given
2. _____________________ 2. SSS
3. _____________________ 3. ________
State why the two triangles are congruent and write the congruence statement. Also list the other pairs of parts that are congruent by CPCTC.
A geometry class is trying to find the distance across a small lake. The distances they measured are shown in the diagram. Explain how to use their measurements to find the distance across the lake.
Vertical angles are congruent.
The triangles are congruent by SAS.
The width of the lake has to be 24.5 yd by CPCTC.
Given: NO || MP, N P
Prove: MN || OP
3. MO MO
6. MN || OP
2. NOM PMO
2. Alt. Int. s Thm.
3. Reflex. Prop. of
4. ∆MNO ∆OPM
5. NMO POM
6. Conv. Of Alt. Int. s Thm.
Given: X is the midpoint of AC . 1 2
Prove: X is the midpoint of BD.
1. X is mdpt. of AC. 1 2
2. AX = CX
2. Def. of mdpt.
3. AX CX
3. Def of
4. AXD CXB
4. Vert. s Thm.
5. ∆AXD ∆CXB
5. ASA Steps 1, 4, 5
7. Def. of
7. DX = BX
8. X is mdpt. of BD.
8. Def. of mdpt.