please solve 19,21,22
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19.the area is 16 cm
20.the cost of 24 kg is 90.00 rupees
21.I am small so I don't know
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19.
Perimeter of square =4a
Perimeter of square =4cm (given)
∴ 4a =4cm
a = 1 cm
Area of square = a²
= 1cm × 1cm = 1cm²
Note : a= side of square
22.
(a) 0
(b) 1 and -1
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