19 cm \text { (b) } 21 cm
Evaluate
399b\left(cm\right)^{2}
Differentiate w.r.t. b
399\left(cm\right)^{2}
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19c^{2}mb\times 21m
Multiply c and c to get c^{2}.
19c^{2}m^{2}b\times 21
Multiply m and m to get m^{2}.
399c^{2}m^{2}b
Multiply 19 and 21 to get 399.
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