Terms  Definitions 

octagon 
eight

reflexive 
reflex; responsive.

hexagon 
polygon with 6 sides

LA of a cube 
4e^2

Negation 
writing negative of statement; OPPOSITE

acute angles 
angles smaller than 90

Incenter 
Point of concurrency for the perpendicular bisector

a statement that can be proven 
theorem

parallel 
extending in the same direction, equidistant at all points, and never converging or diverging:

chord 
a segment whose endpoints are points on the circle

An angle measuring exactly 90 degrees. What am I? 
Right Angle

What do you call ALL foursided shapes? 
Quadrilaterals

conjecture 
the formation or expression of an opinion or theory without sufficient evidence for proof.

polygon 
a closed figure having 3 or more sides

CONGRUENT SEGMENTS 
two segments are congruent if and only if they have the samelength

Regular Polygon 
a polygon that is equilateral and equiangular

conjunction 
a compound proposition that is true if and only if all of its component propositions are true.

therorm 52 
oppisite sides of a parallelogram are cong.

Equivalent Statements 
when 2 statements are both true and false

Informal Proof 
Proof where you write a paragraph to explain why a conjecture for a given situation is true

center 
a circle is named by its center; the point in the middle of a circle

reduction ratio 
an expression of the number of times by which an original document has been reduced in a microcopy.

external secant segment 
the outside section of a secant that has yet to intersect with the circle

fibonacci sequence 
the unending sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, â€¦ where each term is defined as the sum of its two predecessors.

Ray 
Let A and B be two points. The ray AB is the union of AB and all points C such that B is between A and C

Converse Isosceles Triangle Theorem (C.I.T.T.) 
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.

four common families of right triangles 
5, 12, 13
7, 24, 25 8, 15, 17 3, 4, 5 
6 sides 
hexagon

Complimentary Angles 
Cylinder

Hepta 
7 sides

triangle 
3 sided polygon

equiangular 
having all the angles equal.

acuteangles triangle 
contains three acute angles

Parallel Lines 
two lines that never cross

altitude 
the perpendicular distance from the vertex of a figure to the side opposite the vertex.

Rectange 
a parallelogram with four right angles

A triangle with no congruent sides 
Scalene Triangle

coplanar 
being or operating in the same plane.

line segment 
to separate or divide into segments.

supplementary angles 
two supplementary angles add to 180

straight angle 
an angle that measures exactly 180 degrees. It looks like a straight line.

cylinder 
a surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes.

concentric 
having a common center, as circles or spheres.

Trapezoid 
a quadrilateral with only one pair of parallel sides

complementary angles 
two complementary angles add up to 90

adjacent 
2 angles that lie on the same plane, common vertex, common sides, no common interior sides.

line 
a sign painted on cloth and hung over a street, entrance, etc.:

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