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Solid Math Vocab

These vocabulary words accompany chapter 8 of Addison Wesley Grade 3

QuestionAnswer
edge a line segment where two edges meet
face each flat surface of a solid figure
corner where three or more edges meet
vertex where three or more edges meet
vertices plural of vertex
point an exact position
line a set of points that is endless in both directions
line segment part of a line that has two endpoints
ray part of a line that is endless in one direction. It has only one end point
intersecting lines lines that cross at one point
parallel lines lines that never cross
angle made by two rays that have the same endpoint. The endpoint is the vertex of the angle.
right angle makes a square corner, is also called a ninety degree angle
acute angle less than a right angle, less than a ninety degree angle
obtuse angle greater than a right angle, greater than a ninety degree angle.
perpendicular lines line segments or rays that form right angles
polygon a closed figure made of straight line segments
triangle a polygon with three sides
quadrilateral a polygon with four sides
pentagon a polygon with five sides
hexagon a polygon with six sides
octagon a polygon with eight sides
equilateral triangle all sides of the triangle are the same length
isosceles triangle at least two sides of this triangle are the same length
scalene triangle no sides of this triangle are the same length
right triangle one angle of this triangle is a right angle
obtuse triangle one angle of this triangle is obtuse
rectangle a polygon with four right angles - the opposites sides are the same length
parallelogram the opposite sides of this polygon are parallel and the same length
square this polygon has four right angles and all the sides are the same length
rhombus the opposite sides of this polygon are parallel and all sides are the same length
trapezoid this polygon has only one pair of parallel sides
symmetric when two halves of a figure match
line of symmetry the central fold line in a figure
perimeter the distance around a figure, add the lengths of all sides.
area the number of square units needed to cover the region inside of a figure
square unit a square with sides that are each one unit long
volume the number of cubic units needed to fill a solid figure
cubic unit a cube with edges that are one unit long