Isosceles Triangles
Equilateral Triangles
Perpendicular Bisectors
Vocabulary/Theorems
100
Isosceles triangles have ____________ congruent sides.
Possible answers:
2 or more
2 or 3
more than 2 but less than 3 etc.
100
Equilateral triangles have
1.
2.
all sides congruent
all angles congruent
100
All perpendicular bisectors form these types of angles
Right angles
100
The line that splits between two parallel lines to form alternate interior angles
Transversal
200
The congruent sides of an isosceles triangle are called_______________ and the side across from the vertex angle is called the _________________.
legs;base
200
What is the measure of one exterior angle of an equilateral triangle?
120 degrees
200
Line segment YB is a perpendicular bisector. XB = 2x and BZ = 4x-100, find XZ. 
XZ = 200
200
The theorem that says that the interior angles of a triangle equal 180 degrees
Triangle Sum Theorem
300
State the isosceles triangle theorem.
If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
300
Find AB:
AB = 20
300
58
300
A triangle with no congruent sides or angles whose angles are all less than ninety degrees is a...(give the whole
Scalene acute triangle
400
Find the value of x+41:
x=70
400
What is the value of x + 1001
1034
400
An angle bisector bisects an angle that is represented by 4x - 21. What is the expression that represents the measure of the original angle?
8x - 42
400
What does the exterior angle theorem state?
If a triangle has an exterior angle, the exterior angle equals the sum of the two alternate interior angles
500
The measure of each base angle of an isosceles triangle is 7 times the measure of the vertex angle. Find the measure of the vertex angle.
12
500
The perimeter of an equilateral triangle is 120 meters. Find y if each side of the triangle has measure
1/4y+20
160 meters
500
TA is a perpendicular bisector. Angle RTA has measure x+40. Angle ART has measure 4x+100. Find the value of
x^2
x^2 =100
500
Define theorem
A statement that has already been proven