isosceles and equilateral triangles a
angles
angles
Angles of Triangles
Classifying Triangles
Isosceles and Equilateral Triangles vocabulary
Isosceles Triangles sides
100
Find the value of x
55
100
All angles of any triangle must add up to this number
180 degrees
100
All angles are less than 90 degrees, no sides equal
acute scalene
100
Has two congruent sides called legs.
Isosceles Triangle
100
True or False: This triangle is isosceles.
True
200
Calculate the value of x
x=9
200
Solve for x.
x=111
200
one angle greater than 90 degrees, 2 sides equal
obtuse isosceles
200
All three sides are congruent.
Equilateral Triangle
200
True or False: This triangle is isosceles.
False
300
Calculate the value of x
Note: m<2 means angle 2
x=-7
300
Solve for x
x=25
300
one 90 degree angle, two equal sides
right isosceles
300
The angle measure for an equilateral triangle
60 degrees
300
If a triangle has side measures of 6, 4, and 6, is it considered isosceles?
Yes
400
Classify by triangle ABC by its sides
A(-10, 4)
B (-3, -1)
C (-5,11)
Isosceles AB=square root of 74
BC=square root of 148
AC=square root of 74
400
Is it possible to have two 90 degrees in a triangle? Explain
No, 90+90=180 no room for the third angle
400
one 90 degree angle, no sides equal
right scalene
400
What is the name for the congruent angles in an isosceles triangle?
base angles
400
Would a triangle with side measurements of 12, 24, and 18 be considered isosceles?
No
500
Calculate the value of x
x=7
500
Solve for the exterior angle.
136o
500
one 90 degrees, all sides equal
not possible!!!
500
The point where two congruent legs come together.
Vertex Angle
500
Solve for x
x=14