If you mean in carpentry terms, it's called a mitre cut for a straight 45*.
The image at this address should help:
http://www.craftsmanspace.com/images/stories/Basic%20Woodworking%20Cuts/Basic_woodworking_cuts.gif
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When a sphere is cut with a vertical angled plane, the cross-section will be an ellipse. If the sphere is then cut by a horizontal plane, the cross-section will be a circle. Thus, the combination of these two cuts results in an elliptical cross-section from the angled cut and circular cross-sections from the horizontal cuts at various heights.
a triangleTriangle
The longest side in a right angled triangle is called a hypotenuse.
it's a polygon
The side opposite the right angle is called the hypotenuse.