Question

the length and breadth of a rectangle sheet are measured to 5.7cm and 3.4 cm respectively by an ordinary scale reading upto of 0.1cm. find the percentage error in the area of sheet

Answer 1

Length of rectangular sheet , L = 5.7 cm
breadth of rectangular sheet , B = 3.4 cm

area of rectangular sheet, A= L × B
= 5.7 × 3.4 = 19.38 cm²

now, use formula to find percentage error in area.
$\frac{\Delta A}{A}\times100=\frac{\Delta{L}}{L}\times100+\frac{\Delta{B}}{B}\times100$

percentage error in area = 0.1/5.7 × 100 + 0.1/3.4 × 100
= 100/57 + 100/34
= 4.69 %

Answer 2

Answer:

Hope it helps

Explanation: