Chapter 1 Flashcards
Does a point have a size or shape?
No
How do you name a line?
With two points or an italicised letter
How long does a line extend in either direction?
Forever
Does a line have width or height?
No
How do you name a plane?
With three points or a bold capital letter
Does a plane have width or height?
No
How far does a plane extend in any direction?
Forever
Where do parallel planes or lines cross?
No where
Where do perpendicular lines and planes cross?
At 90 degrees
Where do skewed lines cross?
No where
Do intersecting planes cross at any particular point?
No, but they do cross
How do you name a segment?
With two points
Do segments have a distinct length?
Yes
How do you name a ray?
Two points
Does a day have a distinct length?
No
How do you name opposite rays?
The shared end point and any other point on the ray
What do two opposite rays form?
A line
What is the ruler postulate?
It allows you to measure segments and find the distance between them
What are congruent segments?
Segments that have the same length
What is the midpoint?
A point in the middle that divides a line or segment exactly in half
What is a segment bisector?
A point, line, or a ray that divides a segment exactly in half
What is the distance formula?
d= the square root of (x^2-x^1)^2 + (y^2-y^1)^2
What is the midpoint formula?
M= (x^1+x^2/2, y^1+y^2/2)
What is the distance formula do?
It’s used to find the distance between two points
What does the midpoint formula do?
It’s used to find the midpoint between two points
How do you identify an acute angle?
Angle is less than 90 degree
How do you identify a right angle?
The angle equals 90 degrees
How do you identify an obtuse angle?
The angle is greater than 90 degrees
How do you identify a straight angle?
The angle equals 180 degrees
What does it mean if something is complementary?
That two angles equal 90 degrees
What does it mean if something is supplementary?
That two angles equal 180 degrees
How do you name an angle that has only to raise attached to the same endpoint?
By the vertex point or with three points that are on the angle
What must the midpoint be?
A vertex
How do you name an angle with more than two rays?
You must use three letters with the middle letter still representing the vertex
What are congruent angles?
Angles of the same degree measurement
What are adjacent angles?
Two angles attached at the same vertex that are right next to each other
What are vertical angles?
Two angles whose sides are opposite rays
What are complementary angles?
Two angles who have a sum of 90 angles
What are supplementary angles?
Two angles who have a sum of 180 degrees
What things are we allowed to assume?
Angles are adjacent, angles are adjacent and supplementary, angles are vertical
What aren’t we allowed to assume?
Angles/segments are congruent, angle is a right angle, angles are complementary
How do you name a point?
A capital letter
