![]() Acute trianglesĪ triangle is acute if all three of its angles are less than 90 degrees.Īll the triangles shown above are acute. Scalene trianglesĪ scalene triangle has three unequal sides.Īll three angles in a scalene triangle are also unequal. We sometimes call the two equal sides the legs of the triangle, and the other side the base.Įach leg makes an equal angle with the base. ![]() The third side is not equal to the other two (it can be longer or shorter). Isosceles trianglesĪn isosceles triangle has two sides that are equal in length. All equilateral triangles are the same shape, but can be different sizes (we say they are similar). Since the three angles of any triangle always add up to 180 degrees, it follows that each angle in an equilateral triangle must be equal to 60 degrees.Īnd equilateral triangle is a regular polygon. The angle arcs in the corners indicate that the angles are all equal. The tick marks on the three sides indicate that the sides are the same length. Equilateral trianglesĪn equilateral triangle is a triangle where all three sides are the same length, and all three angles are equal: The angles inside any triangle add up to 180 degrees. Obtuse, where one angle is greater than 90 degrees.Right-angled, where one angle is exactly 90 degrees.Acute, where all three angles are less than 90 degrees.Isosceles and scalene triangles can be divided into three types: Scalene triangles, where none of the sides are equal and none of the angles are equal.Isosceles triangles, that have two equal sides and two equal angles.Equilateral triangles, that have three equal sides and three equal angles.A triangle is a shape with three straight sides.
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