The answer will depend on what the shape is and which aspect of the shape is measured by r.
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Area is 98cm2
Well, the area of a rhombus is 1/2*d(1)*d(2). 1/2 * 8 * 14 is 56, so the area of this rhombus is 56 square cm.
The area of rectangle is : 168.0
Area cannot be measured in cm: area is a 2-dimensional measure, cm is only one dimensional. Assuming then, that the area is 660 cm2, total surface area of a cylinder = 2*pi*r*L + 2*pi*r2 where r, the radius is D/2 = 7 cm. So 660 = 14*pi*L + 98*pi That is 14*pi*L = 352.1 So that L = 352.1/(14*pi) = 8.0 cm (approx).
28x24=392 cm2