Answer:
(p, q) Area of the rectangle = Length \[\times \] Breadth \[=p\times q\] \[=pq\] (10m, 5n) Area of the rectangle = Length \[\times \] Breadth \[=(10\times 5)\,\times (m\times n)\] \[=50\times (mn)\] \[=50\,mn\] \[(20{{x}^{2}},\,5{{y}^{2}})\] Area of the rectangle = Length \[\times \] Breadth \[=(4x)\times (3{{x}^{2}})\] \[=(4\times 3)\times (x\times {{x}^{2}})\] \[=12\times {{x}^{3}}=12{{x}^{3}}\] (3mn, 4np) Area of the rectangle \[=(3mn)\times (4np)\] \[=(3\times 4)\times (mn)\times (np)\] \[=12\times m\times (n\times n)\times p\] \[=12\,m{{n}^{2}}p\].
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