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# Geometry

### Vocabulary

TermDefinition
A triangle with three sides of equal length, and three angles of equal measures equilateral triangle
A triangle in which two sides are of equal length, and two angles have the same measure isosceles triangle
A triangle in which all three sides have different lengths, and all three angles have different measures scalene triangle
A triangle with one angle measuring 90 degrees right triangle
congruent having exactly the same size and shape
polygon a closed figure, made up of sides that do not overlap
regular polygon a polygon in which all sides are the same length, and all angles have the same measure
parallel lines that are always the same distance apart, and never intersect
perpendicular lines that intersect to form four right angles
pentagon a five sided polygon
hexagon a six sided polygon
octagon an eight sided polygon
acute angle an angle measuring less than 90 degrees
obtuse angle an angle measuring greater than 90 degrees, but less than 180 degrees
right angle an angle measuring exactly 90 degrees
reflex angle an angle measuring more than 180 degrees
parallelogram a quadrilateral with two pairs of parallel sides
trapezoid a quadrilateral with one pair of parallel sides
vertex point where two lines meet to form an angle
Created by: MrArchung