Question

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Answer 1

Answer:

option A: 164 ± 3cm²

Explanation:

Let the length and breadth of a rectangular sheet are measured by using a meter scale as 16.2 cm and 10.1 cm respectively. Each measurement has three significant figures.

∴ Length l can be written as

l = 16.2± 0.1cm = 16.2cm ± 0.6%

Similarly, the breadth b can be written as

b= 10.1 ± 0.1cm= 10.1cm ± 1%

Area of the sheet,

A= l x b = 163.62cm²± 1.6% = 163.62 ± 2.6cm²

Therefore, as per rule, the area will have only three significant figures and errors will have only one significant figure.

Rounding off, we get A= 164 ± 3cm²

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Answer 2

HEY MATE YOUR ANSWER IS HERE

let the length and breadth of the rectangular sheet are measured by using a metre scale as 16.2 cm and 10.1 respectively

Each measurement has three significant figures ...

LENGTH = 16.2cm ± 0.1 cm

= 16.2cm ± 0.6%

similarly the breath B can be written as can be written as

BREATH = 10.1cm ± 0.1 cm

= 10.1cm ± 1%

AREA OF REC SHEET = L × B

= 163.62cm² ± 1.6%

= 163.62cm² ± 2.6cm²

Therefore, as per rule, the area will have only three significant figures and errors will have only one significant figure.Rounding off,

we get A= 164 ± 3 cm²

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