Who am I?
an angle whose degree measure is exactly 90
a right angle
40 degrees
50 degrees
100 degrees
80 degrees
The equation 30 + x = 90 shows this relationship.
complementary
angles that add up to 90 degrees
complementary angles
What is an angle whose degrees measure is less than 90?
an acute angle
60 degrees
30 degrees
60 degrees
120
40 + 140 = 180 degrees shows this angle relationship.
supplementary
angles that add up to 180 degrees
supplementary angles
What is an angle whose degree measure is greater than 90 and less than 180?
an obtuse angle
37 degrees
53 degrees
47 degrees
133 degrees
2x + 6 = 3x shows two angles that are congruent because they are across from each other and this relationship
vertical angles
angles are congruent because they are opposite from each other are also called this
vertical angles
What is an angle whose degrees measure is exactly 180 and forms a straight line?
a straight angle
x
What is 90 - x?
90 degrees
90 degrees
The measures of a vertical angles are to each other.
congruent
angles that are next to each other are called this
adjacent
What is an angle whose degree measure is greater than 180 and less than 360?
a reflex angle
5x
What is 90 - 5x?
7x
180 - 7x
Lisa knows that ∠A and ∠B are both vertical and supplementary. Which conclusion is true?
A. ∠A and ∠B are adjacent
B. ∠A and ∠B are both 90 degrees angles
C. ∠A and ∠B are both acute
B
Given complementary angles
<A= 39 and < B=2x+1. What is the value of x?
x=25