The actual dimensions of a rectangle are 9cm by 10cm. Alex measures the sides to be 8.65cm by 10.29cm. In calculating the area, what is the relative error, to the nearest thousandth.Answer:
Q. The actual dimensions of a rectangle are 9cm by 10cm. Alex measures the sides to be 8.65cm by 10.29cm. In calculating the area, what is the relative error, to the nearest thousandth.Answer:
Calculate Actual Area: Calculate the actual area of the rectangle using the actual dimensions.The formula for the area of a rectangle is length×width.Actual area = 9cm×10cm=90cm2.
Calculate Measured Area: Calculate the measured area of the rectangle using the measured dimensions.Measured area = 8.65cm×10.29cm.Let's perform the multiplication to find the measured area.Measured area = 89.0055cm2.
Calculate Absolute Error: Calculate the absolute error by subtracting the actual area from the measured area.Absolute error = ∣Measured area−Actual area∣.Absolute error = ∣89.0055cm2−90cm2∣.Absolute error = ∣−0.9945cm2∣.Since we are looking for the absolute value, we take the positive value.Absolute error = 0.9945cm2.
Calculate Relative Error: Calculate the relative error by dividing the absolute error by the actual area.Relative error = Actual areaAbsolute error.Relative error = 90cm20.9945cm2.Let's perform the division to find the relative error.Relative error ≈0.01105.
Convert Relative Error: Convert the relative error to the nearest thousandth.To convert to the nearest thousandth, we round the relative error to three decimal places.Relative error ≈0.011.