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Name__________________________________Per____Date________
Geometry S
Isosceles Triangle
Day 7 CW/HW
Isosceles Triangle
Leg –
Base –
Vertex Angle –
Base Angle –
Isosceles Triangles Have:
Isosceles Right Triangle:
1) Two equal sides (legs)
2) Two equal angles (base ’s)
Questions:
1) Find the vertex angle of an isosceles triangle if the base angle measures 50 degrees.
2) In isosceles triangle ABC, the measure of the vertex angle at C is 30 degrees more than the
measure of each base angle. Find the number of degrees in each angle of the triangle.
3) The measure of each congruent angle of an isosceles triangle is one half of the measure of the
vertex angle. Find the measure of each angle of the triangle.
4) Find the measure of the vertex angle of an isosceles triangle if the measure of each base angle
is 80 degrees.
5) The measure of the vertex angle of an isosceles triangle is 3 times as large as the measure of
each base angle. Find the number of degrees in each angle of the triangle.
6) The measure of each of the congruent angles of an isosceles triangle is 6 degrees less than the
measure of the vertex angle. Find the measure of each angle of the triangle.
7) The vertex angle of an isosceles triangle is 80 degrees. What is the measure of an exterior
angle to one of the base angles of the triangle?
1) Find the base angle of an isosceles triangle if the vertex is 70 degrees.
1) The measure of the vertex angle of an isosceles triangle is 15 degrees more than the
measure of each base angle. Find the number of degrees in each angle of the triangle.
1)
Find the measure of each base angle of an isosceles triangle if the measure of the vertex
angle is 40 degrees.