Multiple choice

Two identical solid cubes of side 5 cm are joined end to end. Then the total surface area of the resulting cuboid is:

  1. 300 cm2

  2. 250 cm2

  3. 225 cm2

  4. 200 cm2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Two 5cm cubes joined form a 10x5x5 cuboid. Surface area = 2(lw + lh + wh) = 2(10*5 + 10*5 + 5*5) = 2(50 + 50 + 25) = 2(125) = 250 cm^2.

AI explanation

When two identical cubes of side 5 cm are joined end to end, the resulting solid is a cuboid with dimensions of 10 cm by 5 cm by 5 cm. The formula for the total surface area of a cuboid is 2 times (length times breadth plus breadth times height plus length times height). Substituting the dimensions gives 2 times (10 times 5 plus 5 times 5 plus 10 times 5), which equals 2 times 125, resulting in a total surface area of 250 cm2.

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