Not exactly because for example two sides of a polygon meet at a vertex which is singular for vertices.
Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).
isosceles triangle
Yes, and a common side too.
A triangle is not a segment joining a vertex and the midpoint of the side opposite the vertex.
Adjacent angles.
Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).Eight quadrilaterals if you cut each one in two from side to side (not vertex to opposite vertex).
isosceles triangle
Yes, and a common side too.
Extend both rays beyond the other side of the vertex.
Assuming you are talking about two triangles, "meet at a side" means they have a shared side. This side has two vertices, each of which is a vertex of both triangles. However, if the triangles only share one vertex, so that the tip of one triangle touches the tip of the other, they will have no side in common.
adjacent angles
They are referred to "adjacent angles"
A prism has the same shape at each side while a pyramid has a vertex as one side and all sides except for the base are a part of the vertex
A triangle is not a segment joining a vertex and the midpoint of the side opposite the vertex.
An angle cannot "share" a vertex and a side.
Adjacent angles.
Adjacent angles.