Properties of 3-D Shapes


3-D shapes can be sorted into 2 categories: 3-D shapes that have only flat surfaces and 3-D shapes that have curved surfaces.


1. Sort the shapes in the list on the previous page into these 2 categories. 3-D shapes with flat surfaces only


2. a) A 3-D shape that only has flat surfaces is called a poly (Hint: the answer is not pocket!)


poly . .


b) A 3-D shape that only has flat surfaces and whose flat surfaces are exactly the same shape and size is called a reg


3. Now sort your list of shapes with flat surfaces only. Poly________


Reg_______ poly________ 4. Look at this diagram of a cube. Can you label the parts the arrows are pointing to?


3-D shapes with curved surfaces


E


F


V


or C


Let’s take a closer look at a cube. a) How many faces does it have? b) Are all the faces flat? c) What does this make it? d) Are all the faces exactly the same size and shape? e) What does this mean? f) How many edges does the cube have? g) How many corners (vertices) does the cube have?


3-D Shapes 151


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