We measure the radius of a disk as {{MATH_1}}. However, our ruler is only allows us an accuracy of {{MATH_2}}. Use differentials to estimate the potential error in the area which results from this potential error in measurement. {{CMD_3}} We are considering the function {{MATH_4}}, where {{MATH_5}}. {{CMD_6}} {{CMD_7}} {{MATH_8}} {{CMD_9}} {{ENV_10}} {{CMD_11}} {{CMD_12}} {{CMD_13}} {{MATH_14}}