Classifying Angles
Angles of a Triangle
Supplementary and Complementary
Vertical Angles
Theorems
100
Angles that are less than 90 degrees
Acute Angles
100
A triangle has angles that measure 30o and 60o. What does the last angle have to measure?
90o
100
The name given to two angles with a sum of 180 degrees?
supplementary angles
100
The measures of vertical angles are what?
Congruent
100
All the angles in a triangle add up to what?
180o
200
Angles that are equal to 90 degrees
Right Angles
200
Find the missing angle below.
The missing angle is 70 degrees.
200
The name given to two angles with a sum of 90 degrees.
complementary angles
200
What is the measurement of angle b?
b = 74
200
How many right angles can a triangle have?
1
300
Angles that are greater than 90 degrees but less than 180 degrees
Obtuse Angles
300
Two interior angle measures of a triangle are 74 degrees and 53 degrees. What is the measure of the third interior angle?
53o
300
If a=65 degrees, what does b=?
b=25
300
Find the measurement of angle b.
b=32 degrees
300
How many obtuse angles can a triangle have?
1
400
Angles that are equal to 180 degrees
Straight Angles
or
A Straight Line
400
Find the missing angle.
85o
400
Solve for x:
x=16
400
What does x= below?
x=22
400
Fill in the blank.
The acute angles of a triangle are _____.
Complementary
or
90o
500
What are angles that are across from each other at two intersecting lines called?
Vertical Angles
500
Can you draw a triangle with the following angle measures? 75o, 75o, and 40o?
No, because 75+75+40 = 190
500
Solve for x:
x = 51
500
Find x:
x=45
500
Exterior angles to triangles are congruent to which other angles?
The sum of the remote interior angles.