Card 1 of 20
EasyStudy card 1
Prompt
What forms an angle?
Answer
Two rays sharing a common endpoint.
MathChapter 16: Lines and Angles
Flashcards
Angles Flashcards
Twenty concise cards on notation, classification, addition, bisectors, vertical angles, and special sums.
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Card 1 of 20. Answer hidden.
Card 2 of 20
EasyStudy card 2
Prompt
What is an angle's common endpoint called?
Answer
The vertex.
Card 3 of 20
EasyStudy card 3
Prompt
In \(\angle ABC\), which letter is the vertex?
Answer
\(B\), the middle letter.
Card 4 of 20
EasyStudy card 4
Prompt
What measure defines a right angle?
Answer
\(90^\circ\).
Card 5 of 20
EasyStudy card 5
Prompt
What measure defines a straight angle?
Answer
\(180^\circ\).
Card 6 of 20
EasyStudy card 6
Prompt
What is the range for an acute angle?
Answer
\(0^\circ<\theta<90^\circ\).
Card 7 of 20
EasyStudy card 7
Prompt
What is the range for an obtuse angle?
Answer
\(90^\circ<\theta<180^\circ\).
Card 8 of 20
MediumStudy card 8
Prompt
State the Angle Addition Postulate.
Answer
An interior ray divides a whole angle into adjacent parts whose measures add to the whole.
Card 9 of 20
MediumStudy card 9
Prompt
What does an angle bisector do?
Answer
Divides an angle into two congruent angles.
Card 10 of 20
MediumStudy card 10
Prompt
What relationship do vertical angles have?
Answer
They are congruent.
Card 11 of 20
MediumStudy card 11
Prompt
What do complementary angles sum to?
Answer
\(90^\circ\).
Card 12 of 20
MediumStudy card 12
Prompt
What do supplementary angles sum to?
Answer
\(180^\circ\).
Card 13 of 20
MediumStudy card 13
Prompt
Must complementary angles be adjacent?
Answer
No; the definition requires only a 90-degree sum.
Card 14 of 20
MediumStudy card 14
Prompt
Must supplementary angles be adjacent?
Answer
No; the definition requires only a 180-degree sum.
Card 15 of 20
MediumStudy card 15
Prompt
What do adjacent angles on a straight line sum to?
Answer
\(180^\circ\).
Card 16 of 20
MediumStudy card 16
Prompt
If an angle bisector creates one 37-degree part, what is the whole?
Answer
\(74^\circ\).
Card 17 of 20
HardStudy card 17
Prompt
How do you solve algebraic vertical angles?
Answer
Set the opposite-angle expressions equal, solve, then evaluate.
Card 18 of 20
HardStudy card 18
Prompt
A 47-degree angle is formed by intersecting lines. What is an adjacent angle?
Answer
\(133^\circ\).
Card 19 of 20
HardStudy card 19
Prompt
What result signals an invalid interior-angle setup?
Answer
A nonpositive measure or one inconsistent with the marked classification.
Card 20 of 20
HardStudy card 20
Prompt
What two-word notes prevent common angle-equation mistakes?
Answer
“Vertical: equal” and “straight: 180.”
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