the horizontal cross-sections of the prisms at the same height must have the same area. (APEX)
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No.The definition of an oblique triangle is "any triangle that is not a right triangle".
there is equilateral triangle, right triangle, isosceles triangle, obtuse triangle, acute triangle, scalene triangle and oblique triangle
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.
By using the cosine rule in trigonometry the angles of the triangle can be worked out.
Oblique lines: