Question

The length and breadth of a rectangle are (5.7+-0.1)cm and (3.4+-0.2)cm respectively. Calculate the area within the error limits

Answer 1

Length = (5.7+- 0.1)cm
Breadth =(3.4+- 0.2)cm
l=5.7cm
delta l= 0.1cm
b= 3.4cm
delta b= 0.2cm
Perimeter p= 2(l+b)
=2(5.7+3.4)
=2(9.1)
=18.2cm
Absolute error in perimeter
delta p= +- 2(delta l+ delta b)
=+- 2(0.1+0.2)
=+- 2(0.3)
=+-0.6cm
Perimeter with error limits
(P+-delta P)= (18.2+- 0.6)cm
is the answer.
Hope you got it.