Rectangle
Areas of plane figures
 
Deduce the formula for the area of a rectangle.
 

This rectangle is divided in squared centimetres. To find its surface area, all you have to do is count them, but surely you will discover a faster method to do this.

You can move the rulers from their ends, one after the other.

Type the number in the small window below and hit Enter.

Take the surface unit you want to use to the yellow circle.

- Which information did you need to find out the surface of the rectangle?

- Which operation did you use?

- Write down the formula for the area of the rectangle.
       
           
  Eduardo Barbero Corral
 
Spanish Ministry of Education , Social Afairs and Sport. Year 2007
 
 

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