Question 30

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

Solution

When two identical cubes are joined side by side , the breadth of the cuboid becomes 2 times the side length of cube.
So, l = 5, b = 2(5) , h = 5.
So, the surface area of cuboid = 2(lb + bh +lh)
= 2(50 + 50 + 25)
= 250.

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