Term
The point where three or more lines intersect 

Definition


Term
A line, segment, or ray that intersects a segment at its midpoint and forms right angles with the segment. 

Definition


Term
The point where the three medians of a triangle intersect 

Definition


Term
A segment in a triangle that connects the midpoints of two sides of the triangle. 

Definition


Term
The point where the three angle bisectors of a triangle intersect. 

Definition


Term
The point where the three perpendicular bisectors of a triangle intersect. 

Definition


Term
A segment in a triangle that connects a vertex of the triangle to the midpoint of the opposite side. 

Definition


Term
Angles formed by parallel lines cut by a transversal that lie in the same relative position 

Definition


Term
Angles formed by parallel lines cut by a transversal that lie on opposite sides of the transversal and in between parallel lines 

Definition
Alternate Interior Angles 


Term
2 non coplanar line that never intersect 

Definition


Term
2 coplanar lines that never intersect 

Definition


Term
Any angles whose sum is 180 degrees 

Definition


Term
Any angles whose sum is 180 degrees 

Definition


Term
Figures that are the same size and same shape 

Definition


Term
Figures that are the same shape (= corresponding angles) but not the same size (sides in proportion) 

Definition


Term
Adjacent angles whose noncommon rays form a straight line 

Definition


Term
A pair of opposite rays that share a common endpoint 

Definition


Term
A spot on a segment that divides the segment into two equal parts. 

Definition


Term
2 angles who share a common ray 

Definition


Term
A line, segment, or ray that intersects an angle at its vertex dividing into two equal angles. 

Definition


Term
Angles formed by a pair of intersecting lines that lie opposite each other. 

Definition

