A pyramid has a polygonal base with all other sides being triangles. As the Egyptians famously demonstrated, a common pyramid has a square base with four triangles meeting at a vertex, but any polygon - regular or irregular - can be used as the base of such a polyhedron.
The shapes that have 3 sides and 3 vertices are called triangles. Triangles are classified based on the lengths of their sides and the measures of their angles. The three most common types of triangles are equilateral triangles (all sides and angles are equal), isosceles triangles (two sides and two angles are equal), and scalene triangles (all sides and angles are different).
All isosceles triangles are not equilateral triangles
Triangles may be right triangles equilateral triangles acute or obtuse triangles
Not so. The two acute angles of a right triangle must add up to 90 degrees.So if the triangles have one congruent acute angle in common, they must alsohave the other acute angle in common, and then they're similar.
Equilateral triangles
they are both angkes
Everything, since they are one.
Their faces are equilateral triangles.
All their angles are less than 90 degrees.
They are both triangles
they both have straight edges
2+10000
two isosceles triangles with common line
triangles
they both have straight edges
pyramid