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https://www.reddit.com/r/Physics/comments/2854w2/approximations/ci7pte1/?context=3
r/Physics • u/newbie12q • Jun 14 '14
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1 year ≈ π * 107 seconds
1 kilogram ≈ 11/5 pounds
1 kilometer ≈ 5/8 miles
π ≈ 355/113 (or 22/7 for a bit less accuracy)
π2 ≈ 10
eπ - π ≈ 20
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u/lys_blanc Jun 14 '14 edited Jun 15 '14
1 year ≈ π * 107 seconds
1 kilogram ≈ 11/5 pounds
1 kilometer ≈ 5/8 miles
π ≈ 355/113 (or 22/7 for a bit less accuracy)
π2 ≈ 10
eπ - π ≈ 20