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Chapter 4: Congruent Triangles
HS Geometry vocabulary related to congruent triangles
22
Mathematics
9th Grade
11/11/2011

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Term
Triangle
Definition
A figure formed by joining segments between three non-collinear points.
Term
Equilateral Triangle
Definition
Triangle with 3 congruent sides.
Term
Isosceles Triangle
Definition
Triangle with at least two congruent sides.
Term
Scalene Triangle
Definition
Triangle with no congruent sides.
Term
Acute Triangle
Definition
A triangle with three acute angles.
Term
Equiangular triangle
Definition
A triangle with three congruent angles.
Term
Right Triangle
Definition
A triangle with one right angle.
Term
Obtuse Triangle
Definition
A triangle with one obtuse angle.
Term
Vertex
Definition
The point where two edges of a triangle meet.
Term
Adjacent sides
Definition
Two sides of a triangle who share a common vertex.
Term
Legs of a Right Triangle
Definition
In a right triangle, the sides that form the right angle.
Term
Hypotenuse
Definition
In a right triangle, the side opposite the right angle; the longest side of a right triangle.
Term
Legs of an Isosceles Triangle
Definition
In an isosceles triangle, the two legs that have the same measure.
Term
Base of an Isosceles Triangle
Definition
The side of an isosceles triangle that is not one of the two congruent sides.
Term
Interior Angles
Definition
The angles that are 'inside' a figure.
Term
Exterior Angle
Definition
An angle that forms a linear pair with an interior angle. This angle is 'outside' the figure.
Term
Corollary
Definition
A statement that can be proved easily using a theorem.
Term
Congruent Figures
Definition
Having corresponding sides and corresponding angles that are congruent.
Term
Corresponding sides
Definition
Pairs of congruent sides in congruent figures.
Term
Corresponding Angles
Definition
Pairs of congruent angles that are in congruent figures.
Term
Vertex Angle of an Isosceles Triangle
Definition
The angle opposite the base in an isosceles triangle.
Term
Coordinate Proof
Definition
A proof involving the placement of geometric figures in a coordinate plane.
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