4.2 Isosceles Triangles
Move points B and/or C. What do you notice?
What do you notice about the two base angles of the triangle?
Isosceles triangle conjecture.
If a triangle is isosceles, then the ____________________________________.
Consider the converse of the isosceles triangle conjecture. If the base angles are congruent, then will the triangle always be isosceles? Move point B and C so that the angles are congruent. How do the sides compare?
Converse of Isosceles Triangle Conjecture
If the base angles of a triangle are congruent, then ______________________.
Move points A and B. What do you notice?
Are equilateral triangles also isosceles?
Is every equilateral triangle also equiangular?