ANS:B - 30°

Well conditioned triangle:all angles >30 & <120.
Ill conditioned triangle: any one angle <30 or >120.
Best conditioned triangle: an isosceles triangle with 2 angles 56.14' A triangle is said to be well-conditioned when its an angle between 30° and 120°. A well conditioned triangle has angle not less than 30 and not more than 120 respectively. In well condition triangles between 30and 120.
Less than 30.
More than 120. A well conditioned triangle mainly consists of nearly equilateral triangle, saying more precisely angles should lie between 30 and 120 degrees. A well conditioned triangle has angles not less than and more than respectively 90 and 120 degrees. A well conditioned triangle should have the following condition ie it should not be less than 20 degrees and not more than 130 degrees.