**Definitions:**

**Millimeter Square** (abbreviation: **mm2**): is the SI derived unit of area. It is the area of a square whose sides measure exactly one millimeter. The square millimeter is derived from the SI base unit of the metre, which itself is the length of the path travelled by light in absolute vacuum within time interval of 1/299,792,458 * 1/1000 of a second.

**Inch Square** (abbreviations: **in2, or si**): (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch.

## How to Convert Millimeters Square to Inches Square

*Example: How many inches square are equivalent to 61.66 millimeters square?*

As;

1 millimeters square = 0.00155 inches square

61.66 millimeters square = Y inches square

Assuming Y is the answer, and by criss-cross principle;

Y equals 61.66 times 0.00155 over 1

(i.e.) Y = 61.66 * 0.00155 / 1 = 0.095573 inches square

Answer is: 0.095573 inches square are equivalent to 61.66 millimeters square.

*Practice Question: Convert the following units into in2:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 87.08 mm2

( ii ) 54.49 mm2

( iii ) 2.5 mm2