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A triangle with three acute angles
A line drawn in a figure to aid in a proof
One of the two angles that have the base of the triangle as a side
The side opposite the vertex angle
Two polygons whose corresponding sides and angles are congruent.
A style of proof that uses coordinate geometry and algebra.
A theorem whose proof follows directly from another theorem
Corresponding angles of polygons
Angles in the same position in two different polygons that have the same number of
Corresponding sides of polygons
Sides in the same position in two different polygons that have the same number of sides.
An abbreviation for "Corresponding Parts of Congruent Triangles are Congruent," which can be used as a justification in a proof after two triangles are proven congruent.
A triangle with three congruent angles.
A triangle with three congruent sides
The set of all points outside a polygon
The angle formed by one side of a polygon and the extension of an adjacent side.
The set of all points inside the figure
The angle formed by two sides of a polygon with a common vertex
The angle formed by two adjacent sides of a polygon.
The common side of two consecutive angles of a polygon.
A triangle with at least two congruent sides.
Leg of an isosceles triangle
One of the two congruent sides of the isosceles triangle.
A triangle with one obtuse angle.
Remote interior angle
An interior angle of a polygon that is not adjacent to the exterior angle.
A triangle with one right angle.
A triangle with no congruent sides.
A property of triangles that states that if the side lengths of a triangle are fixed, the triangle can have only one shape.
The intersection of 2 sides of the triangle
A basic figure that is not defined in terms of other figures
Points that lie on the same line
A flat surface that has no thickness and extends forever