Triangles
Find the Missing Angle
Vocabulary
Missing Triangle Angles
Find x
100
What type of triangle has three angles that are less than 90º?
Acute Triangle
100
What is the measurement of angle COD?
90º
100
What is the name of an angle that is greater than 90º?
Obtuse Angle
100
What is the measurement of angle C?
65º
100
What is x?
100º
200
What type of triangle is this?
Isosceles Triangle
200
What is the measurement of an angle that is complementary to an angle that is 32º?
58º
200
What is the name of two angles that add up to 180º?
Supplementary Angles
200
What is the measurement of the third angle of an Isosceles triangle with two angles that measure 50º?
80º
200
What is t?
t=18
300
Give two different names for this triangle.
Acute and Equilateral
300
What is the measurement of angle e?
97º
300
What is the name of two angles that add up to 90º?
Complementary
300
What is the measurement of angle C?
72º
300
What is x?
30
400
Can you make a scalene triangle with side lengths of 12, 18, and 29? Explain how you know.
Yes because all sides have different lengths and if you add two sides, they are greater than the third side.
12 + 18 > 29
12 + 29 > 18
18 + 29 > 12
400
What is the measurement of angle n?
52º
400
What is the name of two angles that are next to each other and share a side?
Adjacent angles
400
What is the measurement of angle x?
111º
400
What is x?
12
500
Draw an obtuse isosceles triangle with one angle that measures 120º. Then give three possible side lengths.
Two other angle measurements are 30º and 30º. Side lengths can vary as long as they meet the triangle inequality theorem and have two sides that are the same.
500
What is the measurement of angle z?
50º
500
What is the theorem that states that the sum of two sides on a triangle must be greater than the third side?
Triangle Inequality Theorem
500
Find the measurement of each angle.
x=34
3x=102
x+10=44
500
What is x?
80º