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Using CPCTC and HL

Using CPCTC and HL. You know how to use three parts of triangles to show that the triangles are congruent…. SSS. SAS. ASA. AAS. Once you have triangles congruent, you can make conclusions about their other parts because corresponding parts of congruent triangles are congruent.

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Using CPCTC and HL

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  1. Using CPCTC and HL

  2. You know how to use three parts of triangles to show that the triangles are congruent… SSS SAS ASA AAS

  3. Once you have triangles congruent, you can make conclusions about their other parts because corresponding parts of congruent triangles are congruent.  ABC   DEF implies… A  D, B  E, C  F AB DE, BC EF, AC DF

  4. In other words….. CPCTC Congruent Congruent Triangles Parts Corresponding How is this useful?

  5. O Given: MO  RE ME  OR R M Prove: M R E

  6. A T Given: AT  MR AT || MR Prove: A R M R

  7. Let’s complete a flow proof. P Given: l AB l bisects AB at C P is on l Prove: PA = PB A B C l

  8. REVIEW: Isosceles Triangle Theorem – If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

  9. REVIEW: Converse of Isosceles Triangle Theorem – If two angles of a triangle are congruent, then the sides opposite the angles are congruent. Can be referred to as the BASE ANGLE THEOREM.

  10. Theorem: Hypotenuse-Leg Theorem (HL) – If the hypotenuse and a leg of one right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent.

  11. Given: HV  GT GH  TV I is the midpoint of HV G V I H Prove: IGH ITV T

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