**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.

**Kilometer Square** (abbreviation: **km2**): is the SI derived unit of area. It is the area of a square whose sides measure exactly one kilometre. The square metre 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 * 1000 of a second.

## How to Convert Inches Square to Kilometers Square

*Example: How many kilometers square are equivalent to 47.88 inches square?*

As;

1 inches square = 6.4516E-10 kilometers square

47.88 inches square = Y kilometers square

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

Y equals 47.88 times 6.4516E-10 over 1

(i.e.) Y = 47.88 * 6.4516E-10 / 1 = 3.08902608E-8 kilometers square

Answer is: 3.08902608E-8 kilometers square are equivalent to 47.88 inches square.

*Practice Question: Convert the following units into km2:*

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

( i ) 51.78 in2

( ii ) 10.54 in2

( iii ) 9.24 in2