A quadrilateral with four congruent sides and four right angles.
Sum of the lengths of all the sides.
A quadrilateral that has two pairs of adjacent sides that are the same length.
A line segment connecting any two nonadjacent vertices of a polygon.
Every line segment connecting interior points that is entirely contained with the figure's interior.
A quadrilateral that has two pairs of opposite sides that are parallel.
A quadrilateral with four right angles.
A quadrilateral that has only one pair of opposite sides that are parallel.
A triangle with three congruent sides.
A closed plane figure for which all sides are line segments.
A triangle with all three sides of different lengths.
A shape or solid which has a "cave" in it.
Shapes that has the same size.
A triangle with two congruent sides.
A polygon whose sides and angles are congruent.
A polygon with n sides.
A polygon with 12 sides.
A polygon with 10 sides.
Two sides that are adjacent and one after the other.
A four-sided polygon.
A parallelogram with 4 congruent sides.
A polygon with 6 sides.
A polygon with 5 sides.
A polygon with 8 sides.
Two angles that are adjacent and one after the other.
A polygon with 7 sides.
A polygon with 9 sides.
The point where both rays (sides) of an angle meet.
A triangle in which all sides are the same length and all angles are the same size.
A triangle that has a right angle. (90 degree angle)
A triangle in which one angle is larger than 90 degrees.
A triangle in which all three angles are less than 90 degrees.
A triangle in which two sides are the same length and the two base angles have the same measure.
A triangle in which no two sides are of the same length.
The longest side of a right triangle, opposite the right angle.
leg (right triangle)
The two sides of a right triangle that form the right angle.
The third side of an isosceles triangle, it may not be congruent to the other two sides.
leg (isosceles triangle)
The two sides of an isosceles triangle that are congruent.
A triangle in which the three angles are congruent.
Sides of a triangle that share a vertex.
The side across from an angle.
The angle opposite the base of an isosceles triangle.
The sum of the interior angles of a triangle.
The angles opposite the congruent sides of an isosceles triangle.
Two triangles that are have the same shape and size.
An angle that measures less than 90 degrees.
An angle that measures 90 degrees.
An angle that measures more than 90 degrees but less than 180 degrees.
An angle that measures exactly 180 degrees.
Two angles whose sum of measures is 90 degrees.
Two angles whose sum of measures is 180 degrees.
A pair of opposite angles formed by two intersecting lines. They are congruent.
Angles that share a common side and a common vertex.
An angle that measures exactly 0 degrees.
The common endpoint of the two rays that make up an angle.
Angles that have the same measure.
Two rays with a common end point.
The rays that make up an angle.
The unit used to measure angles in geometry (based on 360).
An instrument used to measure angles.
A ray that divides an angle into two congruent angles.
It marks a location and is named by a capital letter; it has no thickness and 0 dimension.
An infinite set of points that goes on forever; it has no thickness and it is one dimensional.
A flat surface that goes on forever in two directions; an infinite set of points; it has no thickness and is two dimensional.
The set of all points. It is three dimensional.
Points that lie on the same line.
Points that do not lie on the same line.
Points that lie on the same plane.
Points that do not lie on the same plane.
The set of points both figures have in common.
Part of a line consisting of two end points and all the points between them.
Part of a line that starts at a particular point and extends infinitely in one direction.
Two lines that intersect to form right angles.
Lines that do not intersect but are in the same plane.
Lines that are not parallel and do not intersect.
Two rays that share a common endpoint but extends in opposite directions and makes a line.
Segments that have the same length.
A point that divides a segment into two congruent segments.
Marks the end of a line segment or ray.
A line that divides a segment at its midpoint to form two congruent segments.
A line that passes through the midpoint of a segment and is perpendicular to that segment.
Two lines that cross at a given point.