Number added to a code (such as a bar code or account number) to derive a further number as a means of verifying the accuracy or validity of the code as it is printed or transmitted.
An equilateral triangle has the following properties. 1  Equilateral triangles have three equal side lengths. 2  Equilateral triangles also have three equal angles of 60 degrees. 3  They also have three equal altitudes.  Is the height of an equilateral triangle equal to its side 1  length. The height is equal to side/2 x  â3.
Classification of Triangles. Triangles may be classified by. (A) their sides. (B) their angles. A scalene triangle has 3 different sides. An isosceles triangle has two equal sides and one side that is not equal. An equilateral triangle has 3 equal sides.In an acute triangle, all of the angles will measure less than 90 degrees. A right triangle will always have one 90-degree angle. An obtuse triangle will always have one angle whose measure is greater than 90 degrees but at the same time less than 180 degrees.Median and Altitude (Height). A median of a triangle is a segment drawn from a vertex of the triangle to the midpoint of the opposite side.lassification of Triangles. Triangles may be classified by. (A) their sides. (B) their angles. A scalene triangle has 3 different sides. An isosceles triangle has two equal sides and one side that is not equal. An equilateral triangle has 3 equal sides.