# 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, 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. 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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