It is the number of degrees of that angle.
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If you mean "altitude", and by that you mean the height of the top of the triangle above its base, then draw a line from the top of the triangle to the base, at right angles to the base, and measure that line. Alternately, the height of a triangle above its base is twice the area divided by the base length.
It means "defined as."
It has to do with the original shapes of numbers. Originally it was not open at the top. Number shapes as we use them come from the number of inside angles they has. 0 had none, 1 had 1, 2 had 2, and so on. Look at the 4 the way it is shaped in this sentence. it has 3 inside angles in the top portion and 1 made by the tail that drops below the triangle that makes the top portion. the original shapes of all the numbers follows a similar pattern.
The number indicates 1913. What the code represents is not known.
Obviously!! That is when you cut the equilateral triangle into two with the help of a line running from the top part of the triangle and stands perpendicular to the base of the triangle.