# Summary

• 2 dimensional shapes measured by length and breadth.
• 3 dimensional shapes measured by length, breadth and height or depth.
• 3-D objects have different views from different position.
• The line segment along which two faces intersect is an edge.
• The points at which three or more faces meet are called vertices.
• A three dimensional figure whose faces are polygons is known as polyhedrons.
• Both prisms and pyramids are named after its base.
• Euler's formula is given by F + V - E = 2. Where F denotes faces, V denotes
• vertices and E denotes edges. This relation is true for any polyhedron.