Lines that intersect to form a right angle.
Lines that intersect to form a right angle.
Lines that intersect to form a right angle.
Lines that do not intersect, always same distance apart.
quadrilateral with two sets of parallel lines, opposite sides and angles are equal
3-sided polygon where the sum of all interior angles is 180 degrees.
quadrilateral with only one set of parallel sides
the number of square units needed to cover a surface
number of cubes needed to fill a 3D object
3D object with two parallel bases and rectangular faces
The sum of the interior angles of a triangle always equals 180 degrees.
The sum of any two side lengths of a triangle is always greater than the length of the third side.
