No.
28 cm is a measurement with one dimension - a length
An area has two dimensions so the units must have 2 dimensions; it would be 28 sq cm or 28 cm²
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The area of rhombus with diagonals 28Cm square and 28Cm is: 392 cm2
28x24=392 cm2
The radius is squared and timed by pi (3.14) 28cm x 28cm x 3.14 = 2461.76cm2
Simple. 7x4=28cm. or Length X Width= Area
a= the square of 7 A equals 28cm