A polygon with four sides
A quadrilateral that has two pairs of parallel sides
A quadrilateral that has exactly two parallel sides
A parallelogram with four right angles
An equilateral parallelogram
A rhombus with four right angles
A parallelogram that is equilateral and equiangular
Two lines that make a square corner at the point of intersection (90⁰)
Point of Intersection
The point where two lines cross.
The angle made by perpendicular lines (90⁰)
Two right angles form a straight angle (180⁰)
An angle that is smaller than a right angle (<90⁰)
An angle that is larger than a right angle and smaller than a straight angle (between 90⁰ and 180⁰)
The endpoint of each segment in a polygon (a corner)
A polygon with an indentation (has an interior angle >180⁰)
Any polygon that does not have an indentation (all interior angles are <180⁰).
A polygon with all equal sides
A polygon with all equal angle measures
A polygon that is equilateral and equiangular
A triangle that has one right angle
A triangle with three acute angles
A triangle with one obtuse angle
A triangle where all of the angles have the same measure of 60⁰.
A triangle that has at least two sides of equal length
A triangle where all three sides have different measures
A triangle where all three sides have the same length
The distance around a geometric object (measured in units)
The distance from the center of a circle to any point on the circle.
The radius of a circle times two
The perimeter of a circle (C=2πr)
The exact number of times the diameter of a circle will go around the circle. Pi is an irrational number, but sometimes we use the approximation 3.14.