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1. MODERN GEOMETRY
Sections 4.2, 4.3
THOMPSON

2. TWO-COLUMN PROOFS

3. PROVING PARTS CONGRUENT
AEFBACEGGiven bisects;||: ABFE :Prove

4. TRIANGLE PROOF QUESTIONS…

5. THEOREMS
If two angles are vertical angles, then they are congruent.
Proof
Converse?
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6. THEOREMS
If a triangle is isosceles, then the angles opposite the congruent sides
are congruent
Proof
Converse?

7. THEOREMS
If a triangle is isosceles, the angle bisector of the vertex is also a
perpendicular bisector of the base
Proof
Converse?

8. EUCLIDEAN CONSTRUCTION PRACTICE
 Construct congruent segment
 Construct congruent angle
 Bisect an angle
 Construct perpendicular from a point to a line
 Construct a perpendicular bisector
 Construct an equilateral triangle