26 



ELEMENTARY GENERAL SCIENCE 



CHAP, 



triangle is equal to the squares of the two other sides added 

 together. 



EXPT. 31. Draw a square inch and a square centimetre, 



side by side, as shown in 

 Fig. 15. 



EXPT. 32. Draw a square 

 decimetre and divide it into 



1 Sty. in/. square centimetres, as shown 



on a reduced scale in Fig. 16. 

 The area of the square is thus 

 shown graphically to be equal 

 to the length multiplied by 

 * a - U - S $%&. m ** fa * the height. Now draw two 



or three oblongs and deter- 

 mine their areas by means of this rule. Determine the areas 

 of the square and oblongs both in square inches and square 



FIG. 16. Square divided into Units of Area. 



centimetres, and use your results to find the number of 

 square centimetres in one square inch, thus : 



