Since there are 2.54 cm in an inch, 3 inches would be 3*2.54, which is 7.62 cm.
OR
If you're saying, "Length of THE THREE INCHES IN A CENTIMETER," then of course, the answer is 3 inches.
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The length of a box that measures 18 cm is approximately 7.1 inches.
2.54 cm = 1 inch therefore divide length in cm by 2.54 to get equivalent length in inches: 70 cm / 2.54 = 27.5591 inches (to nearest 4th decimal).
3
To convert centimeters to inches, you can use the conversion factor of 1 inch = 2.54 centimeters. For 150 cm, the length in inches is approximately 59.06 inches (150 ÷ 2.54). For 120 cm, the length in inches is about 47.24 inches (120 ÷ 2.54). Therefore, the dimensions 150 cm x 120 cm are approximately 59.06 inches x 47.24 inches.
A double quotation mark, as in 5", means "inches - an old-fashioned unit of length equal to 2.54 cm. A single quotation mark, as in 3', means "feet", an old fashioned unit of length equal to 12 inches or 30.48 cm.