Geometry 10 Flashcards

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 four-sided 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 5-2
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, … 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.
acute-angles 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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