Question

. 3 derive the formula for total surface area of cuboid by activity method.​

Answer 1

Answer:

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Answer 2

Answer:

1.

${(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2}\\(a + b)( a+b )\\a(a + b) + b(a + b)\\ {a }^{2} + ab + ab + {b}^{2}\\{a }^{2} + 2 ab+ {b}^{2}$

2.

${( a - b)}^{2} = { a}^{2} - 2 ab+ {b}^{2} \\ (a - b)(a - b) \\ a(a - b) - b(a - b) \\ {a}^{2} - ab - ab + {b}^{2} \\ {a}^{2} - 2 ab+ {b}^{2}$

It's a algebraic identity

Yes

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