1. Warm-up Carmen and Jonathan are trying to determine whether Carmen: by SAS Jonathan: Congruence cannot be determined. Who is correct and why? E C A B 1.5 78 0 2 D F 48 0 1.5 2

2. Another error analysis Find the error(s) in this proof: Given:, Prove: StatementsReasons D BA C 1.Given 2.Reflexive prop 3.Given 4.Alternate interior angles 5.SAS 6.CPCTC

3. Another error analysis Find the error(s) in this proof: Given:, Prove: StatementsReasons D BA C 1.Given 2.Reflexive prop 3.Alternate interior angles 4.Alternate interior angles 5.Alternate interior converse

4. Calculate the distance between (3,7) and (-2,5) Substitute x 1 =3, y 1 =7, x 2 =-2, and y 2 =5 into the distance formula.

5. Triangles with vertices L=(-3,5), M=(1,-4), and N=(10,0). Prove that the triangle is isosceles. Two sides of the triangle have the same length (LM=MN= ), so is isosceles.

6. Given: Coordinates of figure ABCD Prove: C(3a, 0) A(0, 0) B(a, b) D(2a, -b) Each pair of corresponding sides are congruent, the triangles ABC and CDA are congruent by SSS.

7. Your turn Determine whether triangle JKL is congruent to triangle FGH given the coordinate of the vertices. Explain. J(-1,1), K(-2,-2), L(-5,-1), F(2,-1), G(3,-2), H(2,5)