If the question refers to 5 x 3 cm, or 5cm * 3 then the answer is 15 cm.
If the question refers to 5cm x 3cm then it cannot be answered sensibly. The first is a measure of area, with dimensions [L2]. The second is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
If none of the above then the question cannot be answered sensibly because there is no information about the units used for 5x3.
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3 x 5 cm = area 15 square cm BUT a shape 3 x 5 is not a square, it is a rectangle. A square would either be 3 x 3 or 5 x 5 size.
2-cm x 3-cm x 5-cmTwo faces are (2 x 3) = 6 cm2 eachTwo faces are (2 x 5) = 10 cm2 eachTwo faces are (3 x 5) = 15 cm2 eachTotal area = 62 cm2
cm x cm x cm = cm^3 cm^3 is also known as 'mL' ( millilitres) or 'c.c' (cubic Centimetres) . They are different names for the same volume.
1 inch = 2.54 cm 1 foot = 30.48 cm 1 foot = 12 inches 5 feet x 30.48 + 3 inches x 2.54 = 152.4 +7.62 =160.02 cm 5'3" = 160.02 cm
2*3*5 = 30 cubic cm