I am giving some questions below this
Please expert answer me
Of 3,4,5,7 question in one thread

Solution,
The solution 5th query has been provided below: 

assuming keeper is at -9 0n y-axis
 So, area enclosed by two back and keeper is triangle,
  and area of triangle is =12×base×height                                          = 12×6×3                                           = 9 unit2    (Base LR =6 unit, height GL'=3 unit )

since , there is no match of any option so , please check that  the given options are wrong.
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