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JUNIOR GRADE SCIENCE 



by the height, the same rule evidently holds good for determining 

 the area of a parallelogram. 



FiQ. 11. Every parallelogram can be considered as a rectangle. 



A confirmation of this rule is obtained by drawing a number of 

 parallelograms on squared paper. It is found that the area of each, 

 as obtained by the method of counting squares, is equal to the product 

 of the base and perpendicular height. 



Rule. To find the area of a parallelogram multiply the base by the 

 perpendicular height. 



It does not matter which side is considered as base. 



7. AREA OF TRIANGLES. 



i. Area of triangles. Draw two parallel lines upon squared paper, and 

 between them draw two triangles of different shape, but having equal 

 bases. Count the number of small squares in each triangle as before. 

 Measure the number of units of length in the base, and also the perpendicular 

 height. The class results should be collected and tabulated. 



Area of a triangle. When the area of a number of triangles, of 

 different size and shape, is found, and the results tabulated as shown 

 above, inspection shows that the area of each triangle, as found by 



