An 8 sided octagon would fit the given description.
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The corner on a shape where edges meet is called a vertex.
a vertex
square
A right angle.
A shape with one corner is a triangle. Yes, I know, technically it has three sides, but it only has one corner. So, there you have it, a triangle is the shape you're looking for.
Many 3d shapes have a corner.
A rhomboid, possibly. The names of 3-d shapes with plane faces end in the suffix -hedron. If the name is to have 8 letters, that leaves only 2!
Wich 3 D shape has a corner on it?
The hexagon has six corners and six sides.
That would usually be referred to as a vertex.
A OctahedronThis shape has 8 faces.
triangle