Altitude

Angle of depression

Angle of elevation

Apothem

Arc

Bisect (bisector)

Central angle

Centroid

Chord

Circumcenter

Circumscribed

Collinear

Concurrent lines

Conditional statement (including converse,

inverse, contrapositive,&

Biconditional statement)

Construction

Convex & concave polygons

Coplanar

Corollary

Deductive & inductive reasoning

Euclidean & non-Euclidean geometry

Geometric mean

Glide reflection

Incenter

Inscribed

Lateral area

Locus

Negation

Oblique

Orthocenter

Points of concurrency in a triangle

Postulate (axiom)

Proof (formal, two-column, paragraph, flow, coordinate, indirect,

counterexample)

Scalar

Secant line

Sector of a circle

Skew lines

Tangent line

Theorem

Trigonometric ratios (sine,

cosine, tangent)

Undefined terms of geometry

Vector (magnitude and

direction)