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It is the total length of its boundary. There is no need for the boundary to be made up of straight lines or even smooth curves. However, fractals do cause problems.
If the line segments are straight, then it is a triangle.
Depends. Probably not because nothing is perfect! :)i have to disagree - the sides of crystals are straight~*Sigh*All lines are straight. A man-made one may not be, but by the correct definition, all lines are straight. Straight lines are a mathematical concept - an ideal concept - and therefore, conceptually, all lines are straight even if man-made ones are mere approximations.
triangles , polygons ,quadrilaterals
.the BASIC law of a angle is that a angle must be made by two line ,one line can't make any angle ,a straight angle is make by 2 line not 1 ; you it is only one it is because both line are in the same level . Base or this fact a straight angle is a angle Hope this can solve your question