The diagonal of a rectangle is 41 cm and its area is 20 sq. cm. The perimeter of the rectangle must be:
Answers
A) 18 cm	B) 28 cm	C) 30 cm	D) 38 cm	E) 42 cm
l2 + b2 = 41.   Also, lb = 20.   (l + b)2 = (l2 + b2) + 2lb = 41 + 40= 
<gadget id="calculator">41 + 40</gadget>
<output>81</output>
81   (l + b)= 9.   Perimeter = 2(l + b) = 18 cm.   18 cm)
<result>A</result>
The diagonal of a rectangle is 41 cm and its area is 20 sq. cm. The perimeter of the rectangle must be: