OH NO! THE CASE OF THE MISSING DIAGRAM!

1. If one altitude of a triangle bisects the angle it is drawn from, then the triangle is an isosceles triangle.

Given: Diagram:

Prove:

2. A median of an equilateral triangle divides the triangle into two congruent triangles

Given: Diagram:

Prove:

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3. If one altitude of a triangle bisects the angle it is drawn from, then the triangle is an isosceles triangle.

Given: Diagram:

Prove:

4.2

Geo Notes

4. The line segments joining the vertex angle of an isosceles triangle to the trisection points of the base are

congruent.

Given: Diagram:

Prove:

5. Two circles intersect at two points. Prove the segment joining the centers of the circles bisects the segment

joining the points of intersection.

Given:

Prove: