Angle Relationships
Find the Missing Angle
Triangle Sum Theorem
Missing Angles
Vocabulary
100

Two angles are vertically opposite. The measure of the first angles is 42 degrees, what is the measure of the second angle?

42 degrees

100
What is the complement of an angle that measures 12 degrees?
78 degrees.
100
In Triangle ABC, angle A is 37 degrees, angle B is 68 degrees, what is the measure of angle C?
75 degrees.
100

On a straight line, angle a= 35, angle b= 65, angle c=50, what is angle d?

30 degrees.

100
What type of triangle has two congruent sides?
Isosceles Triangle.
200

If angle 1 and 2 are matching on an isosceles triange and the measure of angle 1 is 112, what is the measure of angle 2?

68 degrees.

200

How many degrees is a right angle?

90 degrees.

200
In Triangle DEF, the measure of angle E is 30, angle F is a right angle, what is the measure of angle D?
60 degrees.
200

On a straight line, angle a= 55, angle b= 60, angle c=35, what is angle d?

30 degrees.

200

What is the name of a triangle with three equal angles?

Equilateral Triangle.

300

If angle 1 and 2 are both matching on an isosceles triangle, what angle 3 if angle 2 measures 32 degrees?

116 degrees.

300
What is measure of an angle that is vertical to an angle of 113 degrees?
113 degrees.
300

In Triangle ABC, angle A is 50 degrees, angle B is 90 degrees, what is the measure of angle C?

40 degrees

300

On a straight line, angle a= 55, angle b= 70, angle c=5, angle d=10, what is angle e?

40

300
What is the name of an angle that is 180 degrees.
Straight Angle.
400
What is the relationship of two angles that share a vertex and form when lines two lines intersect?
Vertical Angles.
400

On a straight line, angle a is 160 degrees, how big is angle b?


20 degrees

400
Is it possible to have two right angles in a triangle? Why or why not?
No, because two right angles add up to 180 degrees.
400

On a straight line, angle a is 90 degrees, how big is angle b?

90

400
What is the relationship of two angles that add up to 180? You have to spell it right to get the credit.
Supplementary Angles.
500

What is the relationship between vertically opposite angles?

They are equal

500

On a straight line, angle a= 20, angle b= 70, angle c=25, what is angle d?

65 degrees

500

In Triangle MNO, if angle M is 2x, angle N is 2x+40, and angle I is x-20, what is the sum of the three angles?

180 degrees.

500

In Triangle MNO, if angle M is 2x, angle N is 2x+40, and angle I is x-20, what is the sum of the three angles?

180

500
What is the Exterior Angle Theorem "formula"?
RI + RI = EXT
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