Basic Concepts
Points that lie on the same flat surface
The formula
sqrt((x_2-x_1)^2+(y_2-y_1)^2
calculates this
What is distance?
These angles are equal when lines are parallel
A transformation that slides a figure without changing its orientation
What is a translation?
The sum of interior angles in any triangle
What is 180 degrees?
This postulate states any two points can be connected by exactly one line
What is the ruler postulate?
The point that divides a segment into two equal parts
What is the midpoint?
The sum of consecutive interior angles when lines are parallel
What is 180 degrees?
When reflecting over the y-axis, this coordinate changes sign
What is the x-coordinate?
The number of congruent parts needed for SSS congruence
What is three pairs of sides?
When two lines intersect, this many angles are formed
What is four?
This theorem is the basis for the distance formula
What is the Pythagorean Theorem?
These angles are on opposite sides of the transversal between parallel lines
What are alternate interior angles?
This transformation combines a reflection and translation
What is a glide reflection?
This congruence criterion only works for right triangles
What is HL (Hypotenuse-Leg)?
The exact location in space that has no dimension
What is a point?
The midpoint formula uses this operation with coordinates
What is averaging (or adding and dividing by 2)?
The number of pairs of corresponding angles formed by a transversal
What is four?
A rotation of this many degrees maps a square onto itself
What is 90 degrees?
The sum of the measures of exterior angles of a triangle
What is 360 degrees?
Three or more points that lie on the same line
What are collinear points?
If A(2,3) and B(6,7), this is the midpoint
When these angles are equal, lines cut by a transversal must be parallel
What are alternate exterior angles?
Point (3,4) becomes (−3,4) after this transformation
What is reflection over the y-axis?
When two triangles are congruent by SAS, these parts must be included
What are two pairs of sides and the included angle?