not an obtuse angle
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Oblique means at an angle.
Oblique and Obtuse
A diagonal line is a straight line that connects two non-adjacent corners of a shape, typically forming a 45-degree angle with the sides of the shape. An oblique line, on the other hand, is any line that is neither horizontal nor vertical, and can be at any angle other than 90 degrees. In essence, all diagonal lines are oblique, but not all oblique lines are diagonal.
When a triangle has no angles =to 90 degrees, it is called an oblique triangle.When one of the angles of an oblique triangle is greater than 90 degrees, it can also be called an obtuse triangle.Technically, the triangle described would also be a type of scalene triangle, although we should only call it this when it is defined by the length of its sides, rather than by its internal angles.
The measurements are taken at right angle to the survey line called perpendicular or right angled offsets. The measurements which are not made at right angles to the survey line are called oblique offsets or tie line offsets.