Learning task: Proving statements on triangle congruence

When do you use "CPCTC" in a proof?

• At the beginning

• At the beginning

• At or near the end

• Never

What are the two-column labeled in a proof?

• Reasons / Proof

• Reasons / Given

• Statements / Postulates

• Statements / Reasons

∠AOC≅∠COB  WHAT PROVES YOUR STATEMENT?

• DEFINITION OF ACUTE ANGLE

• DEFINITION OF A MIDPOINT

• DEFINITION OF ANGLE BISECTOR

RN≅RN  

WHAT PROVES YOUR STATEMENT?

• TRANSITIVE PROPERTY

• SYMMETRIC PROPERTY

• REFLEXIVE PROPERTY

• TRANSITIVE PROPERTY

• SYMMETRIC PROPERTY

• REFLEXIVE PROPERTY

A segment with endpoints on the vertex of a triangle and the midpoint on the opposite side.

• SEGMENT BISECTOR

• MEDIAN

• ANGLE BISECTOR

• MIDPOINT

Equilateral triangles are triangles with noncongruent sides.

• TRUE

• FALSE

All the other proofs have to do with triangle congruence. What are the ways to prove triangle congruence?

• AAA, ASA, SAS, SSS, and HL

• AAA, ASA, SAS, SSS, and HL

• AAS, ASA, SAS, SSS, and HL

• SSA, ASA, SAS, SSS, and HL

If you are proving triangles are congruent by SSS, your proof must have three statements showing that corresponding sides are congruent. You are looking for three marked congruent sides, three labeled congruent sides or two of those and one common side. The final reason for this proof would be:

• Proved!

• Done or Finished.

• The triangles are congruent

• SSS Theorem

The first step of a proof is always______

• The introductory statement

• The concluding statement

• The given statement