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# Whitney Geometry

acute triangle A triangle in which all three angles are acute Examples:
angle A figure formed by two rays that have a common endpoint Example:
chord A line segment with its endpoints on a circle Example:
circle A closed plane figure with all points on the figure the same distance from the center Example:
circumference The distance around a circle Example:
closed figure A figure that begins and ends at the same point Examples:
cone A solid figure that has a circular base and one vertex Examples:
congruent Having the same size and shape Example: The triangles are congruent.
congruent figures Figures that have the same size and shape Example: The triangles are congruent.
coordinate plane A plane formed by two intersecting and perpendicular number lines called axes Example:
coordinates The numbers in an ordered pair Example:
cube A solid figure with six congruent square faces Examples:
cylinder A solid figure that has two parallel bases that are congruent circles Examples:
degree (°) A unit for measuring angles and temperature Examples:
diamete A line segment that passes through the center of a circle and has its endpoints on the circle Example: diameter
dimension A measure in one direction; the length, width, or height of a figure
edge The line segment where two faces of a solid figure meet Example: edge
equilateral triangle A triangle with three congruent sides Example:
face A polygon that is a flat surface of a solid figure Example: face
figurate numbers Numbers that can be represented by geometric figures Examples:
hexagon A polygon with six sides and six angles Examples:
hypotenuse In a right triangle, the side opposite the right angle; the longest side in a right triangle Example: hypotenuse
intersecting lines Lines that cross at exactly one point Example: Line EF intersects line GH.
isosceles triangle A triangle with two congruent sides Example:
line A straight path in a plane that goes on forever in opposite directions Example: line AB or line BA
line segment A part of a line that includes two points, called endpoints, and all of the points between them Example: line segment AB or line segment BA
line symmetry A figure has line symmetry if a line can separate the figure into two congruent parts Example:
obtuse angle An angle whose measure is greater than 90° and less than 180° Example:
obtuse triangle A triangle that has one obtuse angle Example:
octagon A polygon with eight sides Examples:
ordered pair A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move horizontally and the second number tells how far to move vertically Example: (1,2) represents 1 unit to the right of zero and 2 units up.
parallel lines Lines in a plane that never intersect Example:
parallelogram A quadrilateral whose opposite sides are parallel and congruent Examples:
pentagon A polygon with five sides Examples:
perpendicular lines Two lines that intersect to form four right angles Example:
(noun) The ratio of the circumference of a circle to its diameter An approximate decimal value of pi is 3.14.
plane A flat surface that extends without end in all directions Example: Planes are named by three points in the plane
plane figure A figure which lies in a plane Examples:
point An exact location in space, usually represented by a dot Example: point A
When a figure can be turned half way about a central point and still look the same Example:
polygon A closed plane figure formed by three or more line segments Examples:
polyhedron A solid figure with flat faces that are polygons Examples:
prism A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles Examples: rectangular prism triangular prism
protractor A tool used for measuring or drawing anglesExample:
pyramid A solid figure with a polygon base and all other faces triangles that meet at a common vertex Example: This is a square pyramid.
quadrilateral A polygon with four sides Examples:
radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle Example: radius
ray A part of a line, with one endpoint, that continues without end in one direction Example: ray CD
rectangle A parallelogram with four right angles Example:
rectangular prism A solid figure in which all six faces are rectangles Example:
reflection (flip) A movement of a figure to a new position by flipping it over a line Example:
regular polygon A polygon in which all sides are congruent and all angles are congruent Examples:
rhombus A parallelogram with four congruent sides Example:
right angle An angle formed by perpendicular lines, line segments, or rays and with a measure of 90° Example:
right triangle A triangle with one right angle Example:
rotation (turn) A movement of a figure by turning it around a fixed point Example:
rotational symmetry The property of a figure that can be rotated less than 360° around a central point and still be congruent to the original figure Example:
scale drawing A drawing that shows a real object smaller than (a reduction) or larger than (an enlargement) the real object Example:
scalene triangle A triangle with no congruent sides Example:
similar figures Figures with the same shape but not necessarily the same size Example:
solid figure A three-dimensional figure Examples: sphere cube
sphere A solid figure that has the shape of a round ball; all points are the same distance from the center Example:
square A rectangle with 4 equal sides Example:
square pyramid A pyramid with a square base and four triangular faces Example:
tangram A puzzle consisting of seven polygon-shaped pieces that can be rearranged to make various figures or shapes Example:
tessellation An arrangement of closed figures that completely covers a surface with no gaps and no overlaps Example:
three-dimensional Measured in three directions, such as length, width, and height Example: heightwidth lengthThe rectangular prism is a three-dimensional figure.
transformation The movement of a figure by a translation, reflection, or rotation Examples: translationreflectionrotation
translation (slide) A movement of a figure along a straight line Example:
trapezoid A quadrilateral with one pair of parallel sides Examples:
triangle A polygon with three sides Examples:
triangular number A number that can be represented by a triangular array Examples:
two-dimensional Measured in two directions, such as length and width Example: widthlength
vertex The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone; the plural of vertex is vertices Examples:
volume The measure of the amount of space a solid figure occupies Example: The volume of this figure is 24 cubic units
x-axis The horizontal number line on a coordinate plane Example:
x-coordinate The first number in an ordered pair, which tells the distance to move right or left from (0, 0) Example:
y-axis The vertical number line on a coordinate plane Example:
y-coordinate The second number in an ordered pair, it tells the distance to move up or down from (0, 0) Example:
Circumference C = x d
Volume of rectangular prism V = l x w x h
Perimeter of polygon = sum of lengths of sides
Perimeter of rectangle P = (2 x l) + (2 x w)
Perimeter of square P = 4 x s
Area of rectangle A = l x w
Area of parallelogram A = bh
Area of triangle A = bh
Created by: whitneyherring