Double Square Foot (abbreviation: ft4): is an imperial unit and U.S. customary unit (non-SI, non-metric) of area moment of inertia, a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis.
Double Square Inch (abbreviations: in4, or in 4): is a unit in the (British) imperial and United States customary systems of measurement of area moment of inertia, a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis.
How to Convert Double Square Feet to Double Square Inches
Example: How many double square inches are equivalent to 64.82 double square feet?
As;
1 double square feet = 20736 double square inches
64.82 double square feet = Y double square inches
Assuming Y is the answer, and by criss-cross principle;
Y equals 64.82 times 20736 over 1
(i.e.) Y = 64.82 * 20736 / 1 = 1344107.52 double square inches
Answer is: 1344107.52 double square inches are equivalent to 64.82 double square feet.
Practice Question: Convert the following units into in4:
N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.
( i ) 87.13 ft4
( ii ) 2.49 ft4
( iii ) 75.2 ft4
