Isosceles Triangle (Properties)
Definition:
An ISOSCELES TRIANGLE is a triangle that has AT LEAST 1 PAIR OF CONGRUENT SIDES.
Directions:
1) Click on the red checkbox to illustrate this definition.
2) Move any 1 (or more) of the vertices of this triangle around. Does it remain isosceles?
3) Click on checkbox 2. Move the vertices of the triangle around again. What do you notice about the base angles?
Questions:
Fill in the following blanks (based upon your observations). The words to complete these statements can be found in the word bank below.
1) If two sides of a triangle are congruent, then the _____________________ opposite those sides are ____________________.
2) The ___________________ of the _________________ angle of an isosceles triangle is the ________________________ ________________ of the base (3rd side).
Word Bank:
bisector angles congruent perpendicular vertex bisector