1. 11/22/13 Gt Geometry Drill
Given E is the midpoint of MJ; TE
perpendicular to MJ
Prove Triangle
T
M
E
J

2. Geometry Objective
STW prove triangles are
congruent using our new
shortcuts!

3. Recall
According to the definition of
congruent triangles If two triangles
are congruent, then their
corresponding parts are
congruent.

4. CPCTC
Corresponding
Parts of
Congruent
Triangles are
Congruent

5. Copy and Prove
Given:FG = OG, bisects FO
GR
Prove: F
O

6. GT Geometry Drill
Put homework on your desk with a pen .
Draw two segments on your paper, one 7 cm
long and the other 9 cm long.
Construct a triangle with two sides congruent
using the segments you drew.
Changes and updates

7. Objective:
STW develop and apply the
Isosceles Triangle Theorem

8. Do you remember?
What is the definition of an
isosceles triangle?

9. ISOSCELES TRIANGLE
vocabulary
legs
vertex angle
base
base angles
C
B
A

10. Isosceles Triangle Theorem
If two sides of a triangle are
congruent, then the angles opposite
those sides are congruent.
C
B
A

11. ???????????????????????
Is the converse true?

12. Converse Isosceles
Triangle Theorem
If two angles of a triangle are
congruent, then the sides
opposite those angles are
congruent.

17. Eyes on Isosceles
Triangles