Assuming the shape is a 3cm x 8cm rectangle, the area of this shape will be 3 x 8 = 24 cm2 - or 24 square centimetres.
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Assuming that the 3 lengths refer to the sides of a triangular shape, the area is 21.331 cm2
That's 3 x 8.
The surface area of a cylinder that has a height of 7 centimeters and a diameter of 8 centimeters is 276.46cm2
The area for a 7cm by 8cm is 56.
120 cm