Question

length and breadth of board are r cm and t cm. what will be the length in cm of the aluminium strip required to frame the board, if 10 cm extra strip is required to fix it properly.​

Answer 1

Answer:

length= r

breadth= t

extra strip is required= 10cm

aluminum strip required=2×(L×b)

= 2rt

extra strip is required = 2rt+10

Answer 2

The length of the aluminium strip required to frame the board is 2(r + t) + 10 cm

Solution:

Given that,

The length and breadth of board are r cm and t cm

We have to frame the perimeter of the board

Therefore, length of aluminium strip required to frame the board will be same as perimeter of board Perimeter of board

Perimeter of rectangle is given as:

Perimeter = 2(length + width)

Perimeter = 2(r + t)

But 10 cm extra strip is required to fix it properly

So add 10 to perimeter of board

Length of aluminium strip = 2(r + t) + 10

Thus length of the aluminium strip required to frame the board is 2(r + t) + 10

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