How many different sets of four dots
can be joined to form a square?
A printable sheet for student use is available here
Topics: Starter  Combinations  Puzzles  Shape
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There is a printable worksheet to go with this activity.
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How many rectangles can be found by joining four dots on the grid?
How many triangles can be found by joining three dots on the grid?
How many polygons can be found by joining dots on the grid?
What are the areas of the polygons that can be found?
Assume that the horizontal and vertical distances between the dots
are one unit and the dots are symmetrically positioned.
Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=April12 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a different type of counting activity.
Other shape counting starters:
How Many Squares 1?
 How Many Squares 2?
How Many Triangles 1?

How Many Triangles 2?  How Many Triangles 3?
How Many Rectangles?
 Rectangles Investigation 
Icosahedron 
Mystic Rose
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