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Question

The length of a rectangular field is 12 m and the length of its diagonal is 15 m. The area of the field is 

(a) 108 m2 (b) 180 m2 (c) 303 m2 (d) 1215 m2


Solution

We know h2=b2+l2 

b2=h2l2  

b2=152122 

                                  =225−144

                                 = 81

b=81

                                      = 9 m. 

Area=Length×Breadth=(12×9) m2=108m2

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