There are 1000 mm in 1 m, so there are 10002 square mm in 1 square meter. 1000*1000=1,000,000 so there are 1,000,000 square mm in 1 square meter. Divide 250 by 1,000,000 and you get 1/4000, or 0.00025, so 250 square mm=.00025 square m. Basically, divide the number of sq. mm by 1,000,000.
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To convert from sq cm to sq mm, multiply by 100.To convert from sq cm to sq mm, multiply by 100.To convert from sq cm to sq mm, multiply by 100.To convert from sq cm to sq mm, multiply by 100.
Area in square mm = pi*radiuis2
To convert square inches to square mm, multiply square inches by 645.16
Area in square mm = pi*1252
1 square inch = 645.16 square mm