Question

please solve with formula

Answer 1

ans is 450

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Answer 2

Answer-

The surface area of the resulting solid is 450 cm²

Solution-

4 cubes are joined side by side. Side length of the cubes are 5 cm.

As shown in the figure, after joining 4 cubes, it becomes a square prism.

The height of the square prism is = 5×4 = 20 cm

The dimensions of the base of the square prism are 5×5

Hence, the surface area of the square prism would be,

$A=2a^2+4ah$

Where,

a = base edge length = 5 cm

h = height of the prism = 20 cm

Putting the values,

$A=2(5)^2+4(5)(20)=2(25)+4(5)(20)=50+400=450\ cm^2$

Therefore, the surface area of the resulting solid is 450 cm²