The actual dimensions of a rectangle are 10cm by 10cm. Alex measures the sides to be 9.75cm by 9.66cm. In calculating the area, what is the relative error, to the nearest hundredth.Answer:
Q. The actual dimensions of a rectangle are 10cm by 10cm. Alex measures the sides to be 9.75cm by 9.66cm. In calculating the area, what is the relative error, to the nearest hundredth.Answer:
Calculate actual area: First, calculate the actual area of the rectangle using the actual dimensions.Actual area = length×widthActual area = 10cm×10cmActual area = 100cm2
Calculate measured area: Next, calculate the measured area of the rectangle using the measured dimensions.Measured area = measured length × measured widthMeasured area = 9.75cm×9.66cmMeasured area = 94.185cm2
Find absolute error: Now, find the absolute error by subtracting the measured area from the actual area.Absolute error = ∣Actual area−Measured area∣Absolute error = ∣100cm2−94.185cm2∣Absolute error = 5.815cm2
Find relative error: To find the relative error, divide the absolute error by the actual area and then multiply by 100 to get the percentage.Relative error = (Absolute error/Actual area)×100Relative error = (5.815cm2/100cm2)×100Relative error = 5.815%
Round relative error: Finally, round the relative error to the nearest hundredth.Relative error (rounded) = 5.82%