Question

THE LENGTH AND BREATH OF A RECTANGULAR ARE 5.7+-0.1 CM AND 3.4+- 0.2 CM CALCULATE AREA OF THE RECTANGAL WITH

Answer 1

L = (5.7 ± 0.1)cm
b = (3.4 ± 0.2)cm

ΔLb = Lb * [ ΔL/L + Δb/b ]
= 5.7*3.4 * [ 0.1/5.7 + 0.2/3.4 ]
= 1.48cm²

Area = Lb + ΔLb
= 5.7*3.4cm² ± 1.48cm²
= (19.38 ± 1.48) cm²