Geometry Vocabulary

Front

Any closed two-dimensional figure with at least three straight sides

Back

polygon

Front

Two-dimensional shape that is NOT classified as a polygon: circle, square, trapezoid, rhombus

Back

circle

Front

Any polygon with four sides, angles, vertices

Back

quadrilateral

Front

Any polygon with five sides, angles, vertices

Back

pentagon

Front

Any polygon with six sides, angles, vertices

Back

hexagon

Front

Any polygon with eight sides, angles, vertices

Back

octagon

Front

Triangle with all angles same length and all angles same size

Back

equilateral

Front

Triangle with one angle larger than 90 degrees

Back

obtuse

Front

Triangle with all angles less than 90 degrees

Back

acute

Front

Same size, same shape

Back

congruent