Definitions
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Geometry | The study that deals with the properties, measurements, and construction of flat figures, and solid figures. |
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Line | The intersection of two surfaces. |
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Point | The intersection of any two lines. |
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Plane | A surface in which a straight line joins any two of it's points. |
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Line Segment | A limited portion of a line. |
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Equal Segment | When two line segments end points can be made to coincide. |
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Midpoint | A line segment is bisected by a point when it is divided into two equal parts by the point. |
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Trisection Points | When two points divide into three equal parts. |
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Angle | The figure formed by two straight lines drawn from the same point. |
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Equal Angles | If they can be made to coincide. |
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Perigon | When the generating line makes a complete revolution. |
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Straight Angles | An angle whose form one straight line extending through the vertex. |
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Adjacent Angles | When two angles have the same vertex and a common side between them. |
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Right Angles | When one straight line meets another so as to make two equal adjacent angles. |
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Perpendicular | When two lines form right angles with each other. |
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Acute Angles | An angle that is less than a right angle. |
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Obtuse Angles | An angle that is greater than a right angle but less than a straight line. |
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Reflex Angles | An angle greater than a straight angle |
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Oblique Angles | An angle other than a right or straight angle. |
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Complementary | Their sum is a right angle. |
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Supplementary | There sum is a straight angle. |
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Vertical Angles | When two straight lines intersect, the two angels not adjacent. |
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Protractor | The instrument used for measuring angles. |
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Triangle | A figure bounded by three straight lines. |
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Base | The side upon which a triangle is supposed to stand. |
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Exterior Angle of the Triangle | An angle formed by one side of a triangle and the adjacent side extended through the vertex. |
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Median of a Triangle | The line drawn from any vertex to the midpoint of the opposite side. |
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Altitude of a Triangle | The perpendicular drawn from a vertex to the opposite side. |
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Scalene Triangle | A triangle which has at least two sides equal. |
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Isosceles Triangle | A triangle which has all three sides equal. |
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Equilateral Triangle | A triangle which has all three sides equal. |
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Acute Triangle | A triangle which has three acute angles. |
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Obtuse Triangle | A triangle which has an obtuse angle. |
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Right Triangle | A triangle which has a right angle. |
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Hypotenuse | The side opposite the right angle. |
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Legs | Other two sides of the right angle. |
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Equi-angular Triangle | A triangle which has three equal sides. |
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Polygon | A plane figure bounded by straight lines. | (blank)
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Sides | The lines of a polygon. | (blank)
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Verticles | Intersections of the polygon. | (blank)
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Base | The side upon which a polygon is supposed to stand. | (blank)
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Interior Angle | An angle formed by two consecutive sides of a polygon. | (blank)
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Exterior Angle | An angle formed by one side of a polygon and the adjacent side extended. | (blank)
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Consecutive | Two sides that meet at any vertex. | (blank)
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Diagonal | A line joining two verticles that are not consecutive. | (blank)
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Convex Polygon | Interior angles is less than 180 degrees. | (blank)
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Concave Polygon | Atleast one interior angle greater than 180 degrees. | (blank)
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Regular Polygon | A polygon which is both equiangular and equilateral. | (blank)
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Center of the Polygon | The common point where the bisectors of the interior angles intersect. | (blank)
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Circle | A closed curve in a plane all of whose points are equally distant from a fixed point. | (blank)
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Circumference | The perimeter of a circle. | (blank)
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Diameter | A line through the center with it's ends on the circle. | (blank)
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Radius | A line joining the center with any point on the circle. | (blank)
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Chord | Any straight line whose ends are on the circle. | (blank)
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Arc | Any portion of a circle. | (blank)
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Semicircle | The arc which represents half a circle. | (blank)
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Quadrant | The arc which represents a quarter of a circle. | (blank)
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Congruent | Two plane figures having the same size and shape. | (blank)
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Corresponding parts | Equal parts of congruent polygons | (blank)
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Axiom | A general statement accepted without proof to be true. | (blank)
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Postulate | A geometric assumption accepted without proof to be true. | (blank)
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Proof | The process of deductive reasoning whereby the truth of a theorem or the correctness of a construction is established. | (blank)
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Theorem | A statement not self-evident but proved by a chain of reasoning. | (blank)
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Construction | A figure that satisfies certain given conditions and is drawn without instruments of measurement. | (blank)
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Corollary | Another geometric statement that is easily deduced from the given theorem just proved. | (blank)
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C.P.C.T.E. | Corresponding Parts of Congruent Triangles are Equal. | (blank)
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Created by:
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