Isosceles Triangle -- from Wolfram MathWorld
An isosceles triangle is a triangle with (at least) two equal sides. In the figure above, the two equal sides have length b and the remaining side has length a. This property is equivalent to two angles of the triangle being equal.

Isosceles triangle - Wikipedia
In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.

Definition of Isosceles Triangle - Maths Resources
Math explained in easy language, plus puzzles, games, quizzes, videos and worksheets. For K-12 kids, teachers and parents.

Triangle - Wikipedia
A triangle is a polygon with three edges and three vertices.It is one of the basic shapes in geometry.A triangle with vertices A, B, and C is denoted .. In Euclidean geometry any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. a two-dimensional Euclidean space).

Triangles - Equilateral, Isosceles and Scalene
Equilateral Triangle . Three equal sides Three equal angles, always 60° . Isosceles Triangle . Two equal sides Two equal angles

Isosceles | Definition of Isosceles by Merriam-Webster
Late Latin isosceles having two equal sides, from Greek isoskelēs, from is-+ skelos leg; perhaps akin to Old English sceol wry

Types of Triangles
Types of Triangles Right triangle: Has one 90 degree angle Equilateral triangle: All angles are the same (60 degrees) Isosceles triangle: Has two angles the same and two sides the same

Proofs involving Isosceles triangles, theorems, examples ...
Proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.

2 Simple Ways to Find the Area of an Isosceles Triangle ...
How to Find the Area of an Isosceles Triangle. An isosceles triangle is a triangle with two sides of the same length. These two equal sides always join at the same angle to the base (the third side), and meet directly above the midpoint of...

Prove Triangle Is Isosceles using Coordinate Geometry
An isosceles triangle has 2 congruent sides and two congruent angles. The easiest way to prove that a triangle is isosceles using coordinate geometry is to use the sides.