Question

how much cardboard is needed to make a single box for length 12 CM by 10 cm and height 7 cm ?

Answer 1

just multiply all .2(12×10)+10×7+7×12
=2×(120+70+84)
2(274)
=548

Answer 2

Hey!
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• $\large{\textbf { Length (l) = 12 cm}}$
• $\large{\textbf { Breadth (b) = 10 cm}}$
• $\large{\textbf { Height (h) = 7 cm}}$

$\textbf{Amount of cardboard needed = TSA of the box}$

$\large{\bf{= 2 (lb + bh + hl)}}$

$\large{\bf{= 2 (12 × 10 × 10 × 7 + 7 × 12)}}$

$\large{\bf{= 2 (120 + 70 + 84)}}$

$\large{\bf{= 2 × 274}}$

$\large{\bf{\fbox{\red{= 548\: sq. \: cm}}}}$