This one looks like the corner of a box sawn off one unit up each of the axes. Three of the sides are right angled iscoceles triangles, and the fourth is an equilateral triangle.
If you also have to draw in the axes, then it has one side in in the negative direction for x. So it should look like the bottom left hand back corner of a box when the box is sitting in front of you with a flat side facing you.
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A tetrahedron is a solid with four plane sides.
This one looks like the corner of a box sawn off one unit up each of the axes. Three of the sides are right angled iscoceles triangles, and the fourth is an equilateral triangle.
If you also have to draw in the axes, then it has one side in in the negative direction for x. So it should look like the bottom left hand back corner of a box when the box is sitting in front of you with a flat side facing you.