Question

1. The dimension of a cubodial box is 20cm(lenght)×10cm(breadth)×8cm(height). Find its surface are excluding it's top area (Find total area except top area)
Please tell the answer..
A HUMBLE REQUEST TO ALL ​

Answer 1

Answer:

680 $cm^{2}$

step by step solution:

Total surface area except top = surface area - top area

                                                 = 2 (lb + bh + lh) - lb

⇒ surface area = { 2 ( 200 + 80 + 160 )  } -  200

⇒ surface area =( 2 × 440) -  200

⇒ surface area = 880 - 200

⇒ surface area = 680 $cm^{2}$

∴ Total surface area except top is  680 $cm^{2}$

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