Correct Answer - Option 1 : 30 and 120 degrees
Concept:
A triangle is stated to be a well-conditioned triangle when all angle in it is more than 30° or lesser than 120°.
A triangle in which an angle of the triangle is less than 30° or greater than 120° is known as ill conditioned triangle.
Equilateral Triangle is the best-suited triangle in Chain Triangulation or Chain Surveying.
Well-conditioned triangles are preferred because their apex points are very sharp and can be located by a single ‘dot’. In such a case, there is no possibility of relative displacement of the plotted point.
