Oblique lines:
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a straight line
Oblique
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.
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.
A graphic of an oblique pyramid can't be shown on Answers.com, due to formatting restrictions. But, imagine if you could move the very top of the Great Pyramid of Gaza, and move it towards the rear, so the top is no longer exactly above the centre of the base, that is an oblique pyramid. There are many pictures of oblique pyramids available on the internet.