1What is angle notation and how is it written with three letters?
Angle notation uses the arc mark (∠) and can be written as ∠ABC or ∠CBA (the middle letter is the vertex)
2What does it mean when we say angles are congruent?
Congruent means same shape, same size
3What is the symbol for congruent angles?
≅
4How can you tell if two angles are congruent using arc marks?
Same number of arc marks means they are congruent
5If two angles are congruent, what can we say about their measures?
If two angles are congruent, then their measures are equal (m∠DEF = m∠XYZ)
6What is a straight angle and what is its measure?
A straight angle measures 180° and forms a straight line
7What is a right angle and what is its measure?
A right angle measures 90° and is marked with a square-shaped arc mark
8What symbol is used to show perpendicular lines?
⊥
9What are adjacent angles?
Angles which share a common side; adjacent means "next to"
10How can you identify if two angles are adjacent?
They must share a common side and a common vertex
11What are complementary angles?
Two angles whose measures add to 90°
12What is the equation for complementary angles?
m∠RSP + m∠PST = 90°
13What are supplementary angles?
Two angles whose measures add to 180°
14What is the equation for supplementary angles?
m∠EFG + m∠HIK = 180°
15What are vertical angles?
Vertical angles are formed when two intersecting lines create two pairs of opposite angles
16What can we say about vertical angles in terms of congruence?
Vertical angles are congruent to each other
17What is a linear pair of angles?
A linear pair consists of exactly 2 angles that are supplementary and adjacent
18What is the Triangle Angle Sum Theorem?
All 3 angles of any triangle will always add up to 180°
19What is the equation for the Triangle Angle Sum Theorem?
m∠BAC + m∠ABC + m∠BCA = 180°
20How can an angle be named using only the vertex?
An angle can be named with just the vertex letter, like ∠B
21How can an angle be named using a number?
An angle can be named with a number, like ∠3 (not degrees)
22What mnemonic helps remember the relationship between complementary and supplementary angles?
C comes before S alphabetically like 90 comes before 180 numerically
23What does the m∠ notation represent?
The m∠ represents the measure of an angle
24How would you write that angle RST is 90 degrees?
m∠RST = 90°
25What's the difference between ∠ABC and m∠ABC?
∠ABC refers to the angle itself, while m∠ABC refers to the measure of the angle
26If ∠DEF ≅ ∠XYZ, what can you write about their measures?
m∠DEF = m∠XYZ