Term
Distance formula for a coordinate plane: 

Definition


Term

Definition


Term

Definition
(x1+x2 over 2, y1+y2 over 2) 


Term

Definition
2 angles that add up to 90° 


Term

Definition
2 angles that add up to 180° 


Term

Definition
all angles and sides are congruent 


Term

Definition


Term

Definition


Term

Definition


Term

Definition
join 2 statements using "and" 


Term

Definition
join 2 statements using "and" true if one or the other or both are true 


Term

Definition


Term

Definition


Term

Definition
reverses the hypothesis and conclusion 


Term

Definition
negates the hypothesis and conclusion 


Term

Definition
negates and reverses the hypothesis and conclusion 


Term

Definition
an if and only if statement (iff) 


Term

Definition
if a conditional is true and the "if" part is true, we conclude the "then" part is true 


Term

Definition


Term
Alternate interior angles: 

Definition
2 angles that are nonadjacent, interior, and on opposite sides of the transversal 


Term
Alternate exterior angles: 

Definition
nonadjacent, outside the lines, and on opposite sides of the transversal 


Term
Sameside interior angles: 

Definition
nonadjacent, interior, same side of the transversal 


Term
Sameside exterior angles: 

Definition
nonadjacent, exterior, same side of the transversal 


Term

Definition
nonadjacent, same side of the transversal, and both above the lines, or both below the lines 


Term
Standard slope equation:
slope: A/B 

Definition


Term
Slopeintercept equation:
slope: m 

Definition


Term
Pointslope equation:
slope: m 

Definition


Term
Horizontal slope equation: slope: 0 

Definition


Term
Vertical slope equation:
slope: undefined 

Definition


Term
Triangle angle sum theorem: 

Definition
The sum of the 3 angles in a triangle is 180° 


Term

Definition
If the hypotenuse and leg of one right triangle is congruent to the hypotenuse and leg of another right triangle, then the triangles are congruent. 


Term

Definition
comparison of the size of 2 items 


Term

Definition


Term

Definition
equation w/2 ratios set equal 


Term
Notation for proportions: 

Definition
a = b means
 
c = d extremes 


Term

Definition
ray/segment that divides an angle into 2 congruent angles 


Term

Definition
segment from a vertex, perpendicular to the opposite side 


Term

Definition
segment from a vertex to the midpoint of the opposite side 


Term

Definition
map length

actual distance
or
model

actual size 


Term

Definition
3 or more lines that intersect in a single point 


Term

Definition
The point where 3 or more likes intersect 


Term

Definition
center of the circumscribed circle
point of concurrency at the perpendicular bisectors of the triangle 


Term

Definition
center of the inscribed circle
point of concurrency of the angle bisectors 


Term

Definition
A segment from a vertex to the midpoint of the opposite side 


Term

Definition
the point of concurrency of the 3 medians of a triangle
*center of gravity of the triangle* 


Term

Definition
segment from a vertex to a line containing the opposite side and meeting at a right angle 


Term

Definition
point of concurrency of the altitudes of a triangle 


Term
Triangle Exterior Angle Theorem: 

Definition
The measure of an exterior angle is greater than the measures of its remote interior angles. 


Term
Triangle Angle/Side Relationships 

Definition
•If 2 sides of a triangle are not congruent, then the longer side is across from the larger angle
•If 2 angles of a triangle are not congruent, then the larger angle is across from the larger side. 


Term

Definition
If 2 sides of one triangle are congruent to two sides of another triange, but the included angles are different, then the triangle with the larger included angle has a larger 3rd side 

