There is no such word as retangler!
A rectangle, with sides of length 24 cm and 12 cm has an area of 288 square cm.
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The perimeter is 24cm
The surface area of a box 15cm x 12cm x 8 cm is 2 times 15cm times 12cm, plus 2 times 15cm times 8 cm, plus 2 time 12cm times 8 cm, or 792cm2. However, this is only the surface area - the actual wrapping paper required would depend on the method of wrapping and how much overlap is desired. Since you would not want to splice the paper, you certainly would need more that 792cm2 but, again, that depends on your wrapping style.
The area of rectangle is : 168.0
The area is ~452.3 cm2
The area of rectangle is : 48.0