 Primary Education INDEX - Introduction - Objectives - Surface Units Rectangle - Deduce the formula - Find out its surface area Parallelogram - Deduce the formula - Find out its surface area Rhombus - Deduce the formula - Find out its surface area Trapezium - Deduce the formula - Find out its surface area Triangle - Deduce the formula - Find out its surface area  Regular Polygon - Deduce the formula - Find out its surface area Circumference - Deduce the formula - Find out its length Circle - Deduce the formula - Find out its surface area
Areas of plane figures
INTRODUCTION

These activities are designed to be viewed on a 17-inch screen and with a resolution of
1024 x 768 pixels because some windows show measurements in centimetres and millimetres that, when viewed with another configuration, won't correspond with reality; and the size of some windows can even be too big.

There are two pages for each geometrical figure. On the first page students have to do the equation of the area of this figure themselves. Therefore, the equation is not given. The next page is an exercise to find out its area.

The dimensions of these figures are generated at random, which allows us to use them an indefinitely, resulting each time in a new exercise.

OBJECTIVES

• To know and use surface measurements adequately.

• To know how to deduce the equation of the area of each flat figure.

• To learn the equation of the area of each flat figure.

• To apply adequately the equations to find out the area of a flat figure.

• To get into the habit of writing down the measurement unit in the outcome of an exercise.

 Eduardo Barbero Corral Spanish Ministry of Education , Social Afairs and Sport. Year 2007 