Define assertion in mathematics.

A statement that you think is true but have not yet proved.

What is an auxiliary line?

An extra line drawn in a figure to reveal hidden structure.

Explain axis of rotation.

A line about which a two-dimensional figure is rotated to produce a three-dimensional figure, called a solid of rotation.

Define central angle.

An angle formed by two rays whose endpoints are the center of a circle.

What is a chance experiment?

A chance experiment is something you can do over and over again, and you don’t know what will happen each time.

Define chord in a circle.

A chord of a circle is a line segment both of whose endpoints are on the circle.

A circle of radius r with center O is the set of all points that are a distance r units from O.

Define circumcenter of a triangle.

The circumcenter of a triangle is the intersection of all three perpendicular bisectors of the triangle’s sides.

What does circumscribed mean?

A polygon is circumscribed by a circle if it fits inside the circle and every vertex of the polygon is on the circle.

What are complementary angles?

Two angles are complementary to each other if their measures add up to 90 degrees.

Define conditional probability.

The probability that one event occurs under the condition that another event occurs.

A cone is a three-dimensional figure with a circular base and a point not in the plane of the base called the apex.

What does congruent mean in geometry?

One figure is called congruent to another figure if there is a sequence of translations, rotations, and reflections that takes the first figure onto the second.

A reasonable guess that you are trying to either prove or disprove.

What is the converse of a statement?

The converse of an if-then statement is the statement that interchanges the hypothesis and the conclusion.

Explain corresponding parts in geometry.

For a rigid transformation that takes one figure onto another, a part of the first figure and its image in the second figure are called corresponding parts.

The cosine of an acute angle in a right triangle is the ratio of the length of the adjacent leg to the length of the hypotenuse.

Define cross section.

The figure formed by intersecting a solid with a plane.

The cube root of a number x, written as ∛x, is the number y whose cube is x.

What is a cyclic quadrilateral?

A quadrilateral whose vertices all lie on the same circle.

A cylinder is a three-dimensional figure with two parallel, congruent, circular bases.

The mass of a substance per unit volume.

Explain dilation in geometry.

A dilation with center P and positive scale factor k takes a point A along the ray PA to another point whose distance is k times farther away from P than A is.

What is a directed line segment?

A line segment with an arrow at one end specifying a direction.

Define directrix in a parabola.

The line that, together with a point called the focus, defines a parabola.

What is a face in geometry?

Any flat surface on a three-dimensional figure is a face.

Define focus in a parabola.

The point that, together with a line called the directrix, defines a parabola.

What is an image in transformations?

If a transformation takes A to A', then A is the original and A' is the image.

Define incenter of a triangle.

The incenter of a triangle is the intersection of all three of the triangle’s angle bisectors.

What does inscribed mean in geometry?

A polygon is inscribed in a circle if it fits inside the circle and every vertex of the polygon is on the circle.

Define inscribed angle.

An angle formed by two chords in a circle that share an endpoint.

What is a line of symmetry?

A line of symmetry for a figure is a line such that reflection across the line takes the figure onto itself.

A set of points on a line with two endpoints.

What is a median in geometry?

A line from a vertex of a triangle to the midpoint of the opposite side.

What are opposite numbers?

Two numbers are opposites of each other if they are the same distance from 0 on the number line, but on opposite sides.

Define outcome in probability.

An outcome of a chance experiment is one of the things that can happen when you do the experiment.

A parabola is the set of points that are equidistant from a given point, called the focus, and a given line, called the directrix.

What does parallel mean in geometry?

Two lines that don't intersect are called parallel.

Define parallelogram.

A quadrilateral in which pairs of opposite sides are parallel.

What is a perpendicular bisector?

The perpendicular bisector of a segment is a line through the midpoint of the segment that is perpendicular to it.

Explain point-slope form.

The form of an equation for a line with slope m through the point (h,k), usually written as y-k = m(x-h).

A prism is a solid figure composed of two parallel, congruent faces (called bases) connected by parallelograms.

The probability of a chance event is a number from 0 to 1 that expresses the likelihood of the event occurring.

A pyramid is a solid figure that has one special face called the base. All of the other faces are triangles that meet at a single vertex called the apex.

IM Geometry Vocabulary Flashcards

Student preview

73 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Define altitude in a triangle.

Back

An altitude in a triangle is a line segment from a vertex to the opposite side that is perpendicular to that side.

2.

FLASHCARD QUESTION

Front

What is an angle bisector?

Back

A line through the vertex of an angle that divides it into two equal angles.

Tags

CCSS.HSG.CO.C.9

3.

FLASHCARD QUESTION

Front

What is an apex in geometry?

Back

The single point on a cone or pyramid that is the furthest from the base. For a pyramid, the apex is where all the triangular faces meet.

Tags

CCSS.1.G.A.1

CCSS.2.G.A.1

4.

FLASHCARD QUESTION

Front

Define arc in a circle.

Back

The part of a circle lying between two points on the circle.

Tags

CCSS.HSG.C.B.5

5.

FLASHCARD QUESTION

Front

What is arccosine?

Back

The arccosine of a number between 0 and 1 is the acute angle whose cosine is that number.

Tags

CCSS.HSF.TF.B.7

6.

FLASHCARD QUESTION

Front

What is arcsine?

Back

The arcsine of a number between 0 and 1 is the acute angle whose sine is that number.

Tags

CCSS.HSF-BF.B.4A

7.

FLASHCARD QUESTION

Front

What is arctangent?

Back

The arctangent of a positive number is the acute angle whose tangent is that number.

Tags

CCSS.HSF.TF.B.7

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