Question

Calculate the total surface area of the cuboid.

Answer 1

Hint:Total surface area of the cuboid to nothing but the sum of area of six rectangles.So, use the formula for total surface area of the cuboid and obtain the required values

Formula used: Total surface area (TSA) = 2$(lb + bh + hl)$

Complete step-by-step answer:
Here, in question,
$
Length\,(l) = 12cm \\
Breadth\,(b) = 5cm \\
Height(\,h) = 7.5cm \\
$
Total surface area =2 [lb + bh + hl] now we put the value of l, b and h in this formula.
$ = 2[12 \times 5 + 5 \times 7.5 + 7.5 \times 12]$
Now we will multiply the numbers
$ = 2[60 + 37.5 + 90]$
Add the values then we will get,
$
= 2 \times 187.5 \\
= 375c{m^2} \\
$

Note: When we know length, width and height then we find the surface area. Make sure to write the appropriate unit associated with it
Surface area means all the area that you can see in two dimensions – this means the length and
width. The surface area of a wall is everything you can paint. The surface area of a floor is everything you can walk on.
So, the surface area of a rectangle, circle, triangle, or any other shape is simply a measurement of everything within the lines of the shape. For a two-dimensional object, that is also its total surface area.