congruent

Having the same measure

two-dimensional

2D, having length and width

attribute

A characteristic

parallel

never intersecting or meeting

degree

A unit for measure for angles and temperatures

polygon

closed figure made by joining line segments

rectangle

A quadrilateral and a parallelogram, angles are congruent and right angles

quadrilateral

2 dimensional object, any 4 sided figure

rhombus

A quadrilateral and a parallelogram, all sides are congruent.

square

A quadrilateral, a parallelogram, a rectangle and a rhombus, all sides are congruent and all angles are congruent.

parallelogram

A quadrilateral, two pairs of opposite sides are parallel.

triangle

3-sided polygon

trapezoid

A quadrilateral with exactly one pair of parallel sides

pentagon

A polygon with 5 sides

hexagon

A polygon with 6 sides

octagon

A polygon with 8 sides

obtuse angle

An angle that measures more than 90 degrees but less than 180 degrees.

acute angle

An angle that is less than 90 degrees

right angle

An angle with a measure of 90 degrees.

acute triangle

A triangle that contains only angles that are less than 90 degrees.

right triangle

a triangle with one right angle

obtuse triangle

A triangle where one angle measures over 90 degrees.

scalene triangle

A triangle, no sides or angles are congruent

isosceles triangle

A triangle, two congruent sides, two congruent angles

equilateral triangle

A triangle, all sides and all angles are congruent