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# Unit 5 Geometry

### Geometry Vocabulary

TermDefinition
Base a face of a three-dimensional shape (solid), usually the face on which it stands
edge the line segment along which two faces of a three-dimensional shape (solid) meet
vertex or corner the point at which the sides of a two-dimensional (flat) shape or the edges of a three-dimensional shape (solid) intersect
triangular prism a three-dimensional shape (solid) with 2 triangular bases and 3 rectangular faces
face a flat surface of a three-dimensional shape (solid)
cube a three-dimensional shape (solid) whose 6 faces are all squares
prism a three-dimensional shape with 2 congruent bases that each have 3 or more sides
rectangular prism a three-dimensional shape (solid) whose 6 faces are all rectangles
scale to increase or decrease in size by a particular ratio
symmetry the property of a shape that can be folded so that the two halves match exactly
line of symmetry a real or imaginary line that divides a shape into two mirror images
reflection a flip of a geometric figure
rotation a turn of a geometric figure
translation a slide of a geometric figure
congruent of the same shape and size; two shapes are congruent if one can be exactly superimposed onto the other using a sequence of rotations, reflections, and/or translations
degree a unit used to measure the size of angles; 1 degree is equal to 1⁄36 of a full rotation
angle the figure formed by 2 rays or line segments that share an endpoint; often measured in terms of the amount of rotation (expressed as some number of degrees) needed to superimpose one of those rays or line segments onto the other
right angle an angle with a measure of exactly 90°
straight angle an angle with a measure of exactly 180°
obtuse angle an angle with a measure greater than 90° and less than 180°
acute angle an angle with a measure greater than 0° and less than 90°
zero angle an angle whose measure is zero degrees
protractor a tool used to measure angles (including angles you want to draw)
hemisphere half of a sphere
circle a two-dimensional (flat) shape made by drawing a curve that is always the same distance from a point called the center
circumference the distance around a circle, cylinder, or widest part of a sphere
radius any line segment that extends from the center of a circle to a point on the circumference of the circle
diameter a line segment between two points on a circle that passes through the center of the circle
line a set of connected points that continues in both directions without end (if it has two endpoints it is a line segment, and if it has one endpoint and continues in one direction without end, it is a ray)
parallel always the same distance apart
intersecting lines lines that contain one common point
perpendicular intersecting at right angles
line segment the set of all points between two endpoints
ray a set of connected points that continues in one direction without end
triangle a two-dimensional (flat) shape with 3 sides
isosceles triangle a triangle with exactly 2 congruent sides
scalene triangle a triangle whose sides are all of different lengths
equilateral triangle a triangle with all sides the same length
right angle an angle with a measure of exactly 90°
hexagon a two-dimensional (flat) shape with 6 sides
rectangle a two-dimensional (flat) shape with two pairs of parallel sides (4 sides total) and 4 right angles
rhombus a two-dimensional (flat) shape with 4 congruent sides
quadrilateral a two-dimensional (flat) shape with 4 sides
square a two-dimensional (flat) shape with 4 congruent sides and 4 right angles
parallelogram a two-dimensional (flat) shape with 4 sides, with both pairs of opposite sides parallel
trapezoid a two-dimensional (flat) shape with 4 sides, exactly 1 pair of which are parallel
polygon a closed two-dimensional (flat) shape with 3 or more sides
pentagon a two-dimensional (flat) shape with 5 sides
square unit a square with sides that measure 1 unit, used to measure area
cubic unit a unit used to measure volume (e.g., cubic centimeter, cubic inch)
tile to cover in square units to measure or illustrate area
perimeter the distance in linear units around a two-dimensional (flat) figure; the perimeter of a circle is called the circumference P= (2 x width) + (2 x length)
volume the total number of cubic units needed to fill a three-dimensional space
area the total number of square units needed to cover a two-dimensional surface A= length x width
Created by: johnstom

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