Question Answer
What is an adjective describing points which lie on the same line? Colinear
What is an adjective describing points which lie on the same plane? Coplanar
Lines intersect in a _____. Point
Planes intersect in a _____. Plane
A polygon is _____ if all of its sides are congruent. Equilateral
A polygon is _____ if all of its interior angles are congruent. Equiangular
A polygon is _____ if it is both equilateral and equiangular. Regular
An unproven statement that is based on a pattern or observation. Conjecture
Process of looking for patterns and making conjectures. Inductive Reasoning
An example that shows a conjecture is false. Counterexample
Has no dimension. It is represented by a small dot. Point
Has one dimension. It extends without end in 2 directions. Line
Has 2 dimensions. It is represented by a shape that looks like a floor or wall. Plane
Statements that are accepted without further justification. Postulates
Points that lie on the same line. Collinear Points
Points that lie on the same plane. Coplanar Points
Lines that lie on the same plane. Coplanar Lines
Part of a line that consists of 2 points, called end points, and all points on the line that are between the endpoints. Segment
Have the same length. Congruent Segments
Endpoint of the angle. Vertex
Measure is between 0° to 90° Acute Angle
Measure is 90° Right Angle
Measure is between 90° to 180° Obtuse Angle
Measure is 180° Straight Angle
Any particular extent of space or surface Area
A straight line extending from the center of a circle or sphere to the circumference or surface Radius
A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end. Diameter
The outer boundary, especially of a circular area Circumference
A plane figure bounded by two radiuses and the included arc of a circle Sector
Relation in degree or number between two similar things. Ratio
An equation stating that two ratios are equivalent. Proportion
Two polygons whose corresponding angles are congruent and the lengths of the corresponding sides are proportional. Similar Polygons
A segment, ray, line, or plane that intersects a segment at its midpoint Segment Bisector
A ray that divides an angle into 2 angles that are congruent Angle Bisector
Two angles whose degrees total 180 degrees Supplementary
a true statement that follows from other true statements Theorem
2 adjacent angles that have noncommon sides on the same line Linear Pair
Uses facts, definitions, accepted properties, and the laws of logic to make a logical argument Deductive Reasoning
A three dimensional shape Solid
A congruent polygon usually found at the top or bottom of a shape Base
The surfaces on planes Face
The sum of polyhedron's surfaces Surface Area
Ratio of lengths of 2 corresponding sides of thw similar polygons Scale Factor
Segment that connects the midpoints of two sides of a triangle Midpoint of a Triangle
Transformation with center C and scale factor K that maps each point P to an image P' so that p" lies on ray CP and CP' = K(CP) Dilation
Amount of surface covered by a figure Area
Distance from the center to a point on the circle Radius
Distance across the circle through the center Diameter
Distance around the circle Circumference
Region of a circle determined by 2 radii and a part of the circle Sector
no line that contains a side of the polygon passes through interior (a shape that doesn't curve in etc). Convex
a polygon that isn't convex (a shape that does curve in). Concave
all sides are congruent Equilateral
all angles are congruent Equiangular
if a polygon is equi/angular/lateral Regular
the three original triangles angles on the inside. Interior Angles
the three extended angles on the outside that are also adjacent to the interior. Exterior Angles
a parallelogram with four congruent sides and angles Square
a parallelogram with four right angles Rectangle
the perpendicular segment from a vertex to the line containing the opposite side Height of a Triangle
When a point is the same distance from one line as it is from another line Equidistant
A segment, ray, or line that is perpendicular to a segment at its midpoint Perpendicular Bisector
a transformation that creates a mirror image Reflection
a line of reflection Line of Symmetry
A quadrilateral with exactly one pain of parallel sides called bases. The nonparallel sides are the legs Trapezoid
a trapezoid with congruent legs Isosceles Trapezoid
A segment that connects the midpoints of two sides of a triangle. Midsegment of a Trapezoid
A triangle with three acute angles Acute Triangle
Two angles at the base of an isosceles triangle Base angles of an Isosceles Triangle
The point at which the three medians of a triangle intersect Centroid
Gives the distance between two points in a coordinate plane. Distance Formula
Angles that are adjacent to the interior angles Exterior Angles
The side opposite the right angle in a right triangle Hypotenuse
The congruent sides of an isosceles triangle. Legs of Isosceles Triangle
A segment from a vertex to the midpoint of the opposite side Triangle Median
A triangle with one obtuse angle Obtuse Triangle
The square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs in a right triangle Pythagorean Theorem
A triangle with one right angle Right Triangle
A triangle with no congruent sides Scalene Triangle
segment whose endpoints are points on a circle Chord
line that intersects a circle in two points Secant
a line in the plane of a dircle that intersects the circle in exactly one point (point of tangency) Tangent
an arc whose endpoints form an angle less than 180 degrees with the center of the circle Minor Arc
an arc of a circle that is longer than a semicircle Major Arc
the measure of an arc Arc Length
an angle placed inside a circle with its vertex on the circle and whose sides contain chords of the circle Inscribed Angle
an arc of the circle in the interior of an angle Intercepted Angle
the action of rotating around an axis or center (fixed point) Rotation
symmetry when obtained by a rotation Rotational Symmetry
sum of the areas of the lateral faces Lateral Area
perpendicular distance between the vertex and the base, height of any of the lateral faces. Slant Height
the number of cubic units contained in the object's interior Volume
a half of a sphere Hemiphere
a point on the segment that divides it into two congruent sides Midpoint
a line that divides the segment into two congruent segments Bisector
two angles that add up to 90 degrees Complimentary Angles
two angles that shares a common vertex and same side. There are no common interior points Adjacent
non-adjacent angles formed by two intersecting lines. They are diagnal to each other Vertical Angles
the “if” contains the hypothesis and the “then” contains the conclusion If-Then Statement
A polygon is _____ if no line that contains a side of the polygon passes through the interior of the polygon. Convex

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