A Triangle.
3 vertices and 3 sides.
10
Not sure about vertices's. The circumcentre is equidistant from a triangle's vertices (no apostrophe).
30, its a combination. C(6,3) because there are six vertices of a hexagon and three vertices of a triangle
Cone
A 3-d triangle, or a tetrahedron, has 4 vertices.
There is not such thing as a three-dimensional triangle. You are thinking of a tetrahedron which is a three-dimensional figure with each side being a triangle. This has four vertices.
A Triangle.
A triangle has 3 vertices and 3 sides
A triangle has three sides and three vertices.
A triangle has three sides and therefore three vertices, or angles.
6 vertices
3 vertices
5 vertices.
6 vertices
All triangles have 3 vertices