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Equilateral, Isosceles and Scalene. There are three special names given to triangles that tell how many sides (or angles) are equal. There can be 3, 2 or no equal sides/angles:
- Right Triangles. A right triangle has one 90° angle and a variety of often-studied topics: Pythagorean Theorem. Pythagorean Triplets. Sine, Cosine, Tangent. Pictures of Right Triangles.
- Equilateral triangle. The Equilateral triangle shown on the left has three congruent sides and three congruent angles. Each angle is 60°.
- Isosceles triangle. The Isosceles triangle shown on the left has two equal sides and two equal angles.
- Scalene Triangle. The Scalene Triangle has no congruent sides. In other words, each side must have a different length.
An equilateral triangle is defined as a triangle with 3 congruent sides and angles. Thus, by their definitions, an equilateral triangle is always also an isosceles triangle. However, whenever we have an equilateral triangle, by convention it will be referred to as an equilateral triangle not an isosceles triangle. Isosceles triangle formulas
In geometry, an isosceles triangle (/ aɪ ˈ s ɒ s ə l iː z /) is a triangle that has two sides of equal length. Sometimes it is specified as having exactly 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.
There are 4 types of triangle. They all have 3 sides and are polygons. 1. Equilateral. Equilateral triangles have 3 equal sides and 3 equal angles of 60°. 2. Isosceles. Isosceles triangles have 2 ...
An equilateral triangle is the one in which all the three sides are equal. It is a special case of the isosceles triangle where the third side is also equal. In the triangle ABC, AB = BC = CA. Properties of an equilateral triangle are: It has 3 equal sides. It has 3 equal angles. Since the sum of the interior angles is 180 degrees, every angle ...
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An isosceles triangle is a triangle that has (at least) two equal side lengths. If all three side lengths are equal, the triangle is also equilateral. Isosceles triangles are very helpful in determining unknown angles. In an isosceles triangle, the two equal sides are called legs, and the remaining side is called the base. The angle opposite the base is called the vertex angle, and the point ...
