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A rectangular plate has a length of (21.3\pm0.2) cm and a width of (9.80\pm 0.1) cm. Find the area of the plate and the uncertainty in the calculated area. Solution Area = lw = (21.3\pm0.2 cm) X (9.80\pm0.1 cm) \cong(21.3 X 9.80 \pm 21.3 X 0.1 \pm 0.2 X 9.80) cm^2...