The Parts of a 3D Shape

COUNTING FACES AND EDGES OF 3D SHAPES Watch this video for a couple of examples of how to count all the faces and edges of 3D shapes. Don't forget the "hidden" faces you can't see in 3D! This is called a CUBOID (cool name, eh?) or a rectangular prism. Use the picture to help you count up the number of FACES (flat surfaces), EDGES (where two faces meet), and VERTICES (where three or more faces meet). Number of FACES: 6Number of VERTICES: 8Number of EDGES: 12 This is called a RECTANGULAR PYRAMID, because it has a rectangle base and all its other surfaces meet at one point. Use the picture to help you count the faces, vertices, and edges. Number of FACES: 5Number of VERTICES: 5Number of EDGES: 8 Here's a tricky one! If you want, use a can at home to help you figure out how many faces, vertices, and edges this CYLINDER has.HINT 1: One of the surfaces is curved - does that count as a face?HINT 2: Run your finger along the edges of the can to count them.HINT 3: Remember VERTEX are where 3 or more faces meet up. So if only 2 faces meet up, it is not a VERTEX. Number of FACES: 2Number of VERTICES: 0Number of EDGES: 2 No nice little yellow circles to give you hints this time! You can do it! Find the number of faces, vertices, and edges. Don't forget the ones in the back! Number of FACES: 5Number of VERTICES: 6Number of EDGES: 9 How many faces does a SPHERE have?HINT: Check the first question in this worksheet. Infinity faces - it just keeps going and going. 1 face - we're all on the same planet! No faces - faces can't be curved.