Geometry

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plane
an unbounded two-dimensional shape
ray
a group of nearly parallel lines of electromagnetic radiation
postulate
maintain or assert
theorem
an idea accepted as a demonstrable truth
determined
having been learned or found especially by investigation
vertex
the highest point of something
collinear
lying on the same line
integer
any natural number or its negative, or zero
determine
find out or learn with certainty, as by making an inquiry
measure
determine the dimensions of something or somebody
congruence
the quality of agreeing; being suitable and appropriate
customary
commonly used or practiced
ruler
a person who governs or commands
acute
ending in a sharp point
obtuse
of an angle, between 90 and 180 degrees
congruent
corresponding in character or kind
bisect
cut in half or cut in two
infinite
having no limits or boundaries in time or space
obtuse angle
an angle between 90 and 180 degrees
acute angle
an angle less than 90 degrees but more than 0 degrees
obtuse triangle
a triangle that contains an obtuse interior angle
equilateral
having all sides of the same length
scalene triangle
a triangle with no two sides of equal length
isosceles triangle
a triangle with two equal sides

Created on 七月 27, 2008 (updated 十月 9, 2010)