The volume of a cuboid is 54cm3. If the length, width and height of the cuboid are in the ratio 2:1:1 respectively, find its total surface area
Answer Details
To solve this problem, we first need to find the dimensions of the cuboid. Let the length, width and height be 2x, x and x respectively. Then we have:
Volume of cuboid = length x width x height
54 = 2x * x * x
54 = 2x^3
x^3 = 27
x = 3
Therefore, the length of the cuboid is 2x = 6cm, the width is x = 3cm, and the height is x = 3cm.
To find the total surface area, we need to find the area of each face and add them up. The total surface area is given by:
Total surface area = 2lw + 2lh + 2wh
= 2(6*3) + 2(6*3) + 2(3*3)
= 36 + 36 + 18
= 90 cm^2
Therefore, the total surface area of the cuboid is 90cm^2. The correct answer is option B.