Segments that have the same length

Segment Addition Postulate

If A, B, and C are collinear points and B is between A and C then $$\overline{AB}$$ + $$\overline{BC}$$ = $$\overline{AC}$$

The point that divides a segment into two congruent segments

Lines in the same plane that never intersect

Lines that intersect to form right angles

A line, ray, or segment that divides an angle or segment into two equal parts

Perpendicular Bisector

Aline, ray, or segment perpendicular to a segment at its midpoint

The intersection of two rays at a common endpoint

Two angles that share a common side and vertex

Congruent angles that are opposite each other when two lines intersect

A line that intersects two or more lines at different points

The common endpoint of an angle. (Where the sides intersect)

An angle with a degree measure of 90 degrees

An angle with a degree measure less than 90 degrees

An angle with a degree measure greater than 90 degrees but less than 180 degrees

Two angles whose measures add up to 180 degrees

An angle with a degree measure of 180 degrees

Angles that have the same measures

Angle Addition Postulate

If ∠ABD and ∠DBC are adjacent, then ∠ABD + ∠DBC = ∠ABC

Adjacent angles that are also supplementary

Angles on the same side of the transversal and in the same position

Alternate Interior Angles

Angles on different sides of the transversal and inside the 2 parallel lines

Alternate Exterior Angles

Angles on different sides of the transversal and outside the 2 parallel lines

Consecutive (Same-Side) Interior Angles

Angles on the same side of the transversal and inside the 2 parallel lines

Consecutive (Same-Side) Exterior Angles

Angles on the same side of the transversal and outside the 2 parallel lines

A triangle with one obtuse angle

A triangle with one right angle

A triangle with ALL acute angles

A triangle with no congruent sides

A triangle with 2 congruent sides

A triangle with all congruent sides

Triangle Angle Sum Theorem

The sum of the angles in a triangle is 180

Exterior Angle Theorem

An exterior angle is always equal to the sum of the two non-adjacent interior angles

Isosceles Triangle Theorem

If two sides of a triangle are congruent, then the angles opposite those sides are congruent

Corresponding parts of congruent Triangles are congruent

Side opposite the right angle in a right triangle

The two sides that make up the right angle in a right triangle. (The sides adjacent to the right angle)

The angle formed by (between) the given sides of the triangle.

A segment that connects the midpoints of two sides of the triangles

Triangle Midsegment Theorem

If a segment joins the midpoint of two sides of a triangle, then the segment is parallel to the third side and half as long

Perpendicular Bisector Theorem

If a point lies on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segment.

The point where all of the perpendicular bisectors of a triangle intersect. It is always equidistant from the vertices.

The point at which all the angle bisectors of a triangle intersect. It is equidistant from all the sides of the triangle.

A segment joining a vertex to the midpoint of the opposite side.

Geometry Vocab Flashcards

Student preview

82 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Point

Back

A location with no size or shape

2.

FLASHCARD QUESTION

Front

Line

Back

Made up of points with no thickness or width

3.

FLASHCARD QUESTION

Front

Line Segment

Back

A measurable part of a line consisting of two endpoints

4.

FLASHCARD QUESTION

Front

Ray

Back

A line that extends indefinitely in one direction

5.

FLASHCARD QUESTION

Front

Plane

Back

A flat surface made up of points that extends indefinitely in all directions

6.

FLASHCARD QUESTION

Front

Collinear

Back

Points that lie on the same line

7.

FLASHCARD QUESTION

Front

Coplanar

Back

Points that lie on the same plane

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