The diagonal of a rectangle is cm and its area is 20 sq. cm. The perimeter of the rectangle must be:
Choose the correct choice from the following options:  A) 18  B) 77  C) 625  D) 276  E) 191
Explanation:   (or) {\color{Black} l^{2}+b^{2}=41}   Also,   {\color{Black} (l+b)^{2}=l^{2}+b^{2}+2lb}   = 41 + 40= 
<gadget id="calculator">41 + 40</gadget>
<output>81</output>
81   (l + b)= 9.   Perimeter = 2(l + b) = 18 cm.   18nswer: 18) 18
<result>A</result>
The diagonal of a rectangle is cm and its area is 20 sq. cm. The perimeter of the rectangle must be: