Posted by **mohan** on Tuesday, October 27, 2009 at 9:18am.

how do i change 30.50 in^2 to mm^2

my conversion sheet says its

1 inch =25.4mm

- math -
**mohan**, Tuesday, October 27, 2009 at 9:22am
So i did the following:

30.50in^2 * 25.4mm =774.7mm

but i dont know if i should square it or not?.. im confused please help

- math -
**jim**, Tuesday, October 27, 2009 at 9:27am
1 inch =25.4mm. That is right.

But when squaring, you have to square both the units _and_ the numbers, so

1 inch = 25.4 mm

(1 inch)^ = (25.4mm)^2

(1^2) inch^2 = (25.4^2) mm^2

1 in^2 = 645.16 mm^2

Or think of it this way:

Draw a 3-inch line. That's 3 inches.

Now make a square from it with 3 inches on each side. How many square inches is that?

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