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Question

The dimensions of a right rectangular prism are 4 inches by 5 inches by 6 inches. What is the surface area, in square inches, of the prism?

  1. 30
  2. 74
  3. 120
  4. 148

The correct answer is: 148


    HINT :-  surface area of rectangular prism is given br A = 2 (lb + bh + hl) whereas l is length, b is breadth and h is height of the rectangular prism.
    Given , the rectangular prism is 4 by 5 by 6 inches
    I.e l  = 4 inch , b = 5 inch and h = 6 inches respectively.
    Then surface area A = 2(4 × 5 + 5 × 6 + 6 × 4)
    A  = 2( 20 + 30 + 24 )
    A = 2 (74) = 148 sq.inches.
    The required surface area is 148 sq.inches 

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