Question

find the total surface area of a tiffin box with dimensions 15 cm,9cm and 7 cm.​

Answer 1

Given that dimension of the tiffin box are 15 cm, 9 cm and 7 cm respectively So, the tiffin box must be a cuboid as only cuboid has such dimensions.

We can find total surface area of cuboid by the given formula:-)

$TSA = 2(lb + bh + hl)$

where l, b and h are Length breadth and height of the cuboid respectively.

So,

$TSA = 2(135 + 63 + 105) \\ = 2 \times 303 \\ 606 {cm}^{2}$