Unit 2B Vocabulary Hicks Geometry

Front

A quadrilateral with two sets of parallel sides

Back

Parallelogram: A four-sided figure (quadrilateral) where opposite sides are parallel and equal in length.

Front

Symbol representing congruence in geometry

Back

Congruent (≅): Indicates that two figures have the same shape and size.

Front

How we state that a triangle is congruent to another triangle.

Back

Congruence statement: A formal way to express that two triangles are congruent, often using the notation ΔABC ≅ ΔDEF.

Front

The theorem used when the hypotenuse and one leg of a right triangle are congruent to another right triangle.

Back

HL (Hypotenuse-Leg) Theorem: States that if the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and one leg of another right triangle, then the triangles are congruent.

Front

The relationship between an exterior angle and the two opposite interior angles in a triangle.

Back

Exterior Angle Theorem: The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

A four-sided figure with only one pair of parallel sides.

Back

Trapezoid: A quadrilateral with at least one pair of parallel sides.

Front

The property that states if two triangles have equal corresponding angles, they are similar.

Back

AA (Angle-Angle) Similarity: If two angles of one triangle are equal to two angles of another triangle, the triangles are similar.

Front

The theorem that states if three sides of one triangle are equal to three sides of another triangle, the triangles are congruent.

Back

SSS (Side-Side-Side) Congruence: If three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent.

Front

The theorem that states if two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, the triangles are congruent.

Back

SAS (Side-Angle-Side) Congruence: If two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, then the triangles are congruent.

Front

The term for angles that are opposite each other when two lines intersect.

Back

Vertical Angles: Angles that are opposite each other when two lines intersect; they are always congruent.