A triangle is said to be well-conditioned when no angle in it is less than 30 degrees or greater than 120 degrees. An equilateral triangle is considered to be the best-condition or ideal triangle.
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a triangle that all the angles within it are between 30 and 120 degrees. an equilateral triangle is ideal
a triangle has three diagonals as well as three sides
An Isosceles triangle has at least one line of symmetry but if it has more than one line of symmetry it can be an Equilateral triangle as well as a Isosceles Triangle. So a triangle with one line of symmetry is always Isosceles and If it has more than one it is always an Equilateral triangle as well as an Isosceles triangle. Example of an Isosceles triangle:
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If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.