line (or ray or segment) added to a diagram to help in a proof
the angles whose vertices are the endpoints of the base of the triangle
Transformation that changes the position of the figure without changing its size or shape. Rotation, Translation or Reflection.
polygons with same size and shape
A proof involving placing geometric figures in a coordinate plane.
(logic) an inference that follows directly from the proof of another proposition
Sides or angles that occupy the same relative positions in similar polygons.
A triangle with 3 congruent angles
a triangle with three congruent sides
An angle formed by one side of a polygon and the extension of an adjacent side
a type of proof that uses arrows to show flow of a logical argument statements are connected by arrows to show how each statement comes before it. and each reason is written below the statement it justifies
An angle created by two adjacent sides
the common side of two consecutive angles of a polygon
a triangle with two equal sides
a triangle that contains an obtuse interior angle
A transformation that "flips" a figure over a mirror or reflection line.
remote interior angles
the two nonadjacent interior angles corresponding to each exterior ange of a triangle
a triangle with one right angle
(mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
a triangle with no two sides of equal length
(mathematics) a transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same