Geometry: Right Angle Definitions and Congruent Parts

A set of vocabulary flashcards covering basic geometric definitions, properties of right angles, and triangle congruence as outlined in the lecture notes.

Perpendicular ($\perp$)

The relationship between two lines or segments that intersect to form right angles.

Right Angle Congruence Theorem

The geometric principle stating that all right angles are congruent ($\cong$).

Perpendicular Bisector

A line or segment that is perpendicular to another segment at its midpoint, such as line $KM$ bisecting segment $JL$ at point $O$ to make $JO \cong OL$.

Altitude

A line segment through a vertex and perpendicular to (i.e., forming a right angle with) a line containing the base, such as segment $BD$ to $AC$ at point $D$.

Congruent Triangles

Triangles that have the same shape and size and have a one-to-one correspondence where all angles and sides are equal and matching.

Congruent Symbol

The mathematical symbol $\cong$ used to indicate that two figures are congruent.

Corresponding Parts

The specific angles and sides that match in position when two triangles are compared in a one-to-one correspondence.

Midpoint Definition (or Bisector)

A point or segment that divides a line segment into two congruent parts, as seen when a perpendicular bisector creates segment $JO \cong OL$.