**Definitions:**

**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.

**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.

## How to Convert Inches Square to Millimeters Square

*Example: How many millimeters square are equivalent to 64.27 inches square?*

As;

1 inches square = 645.16 millimeters square

64.27 inches square = Y millimeters square

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

Y equals 64.27 times 645.16 over 1

(i.e.) Y = 64.27 * 645.16 / 1 = 41464.4332 millimeters square

Answer is: 41464.4332 millimeters square are equivalent to 64.27 inches square.

*Practice Question: Convert the following units into mm2:*

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

( i ) 47.39 in2

( ii ) 60.64 in2

( iii ) 29.56 in2