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The sides of a rectangle are (10.5 +- 0....

The sides of a rectangle are `(10.5 +- 0.2) cm and ( 5.2 +- 0.1 ) cm`. Calculate its perimeter with error limits .

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The correct Answer is:
`0.6 cm ; 31.4 +- 0.6 cm`
` l = 10.5 +- 0.2 cm , b = 5.2 +- 0.1 cm`
`P = 2 l + 2 b = 31.4 cm, DeltaP = 2( Delta l + Delta b) = 0.6 cm`
So `P = 31.4 +- 0.6 cm`
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