USEFUL CONVERTION OF UNITS
Length
1 cm = 10 mm
1 in = 2.54 cm
1 ft = 12 in
1 yd = 3 ft = 36 in
1 mtr = 3.28 ft = 100cm
1 dekameter = 10 mtrs
1 km = 1000 mtrs = 0.621mi
1 mi = 1.609 km = 5280 ft
Time
1 min = 60 sec
1 hr = 60 min
1 day = 24 hrs
1 week = 7 days
1 month = 30 days (regular)
1 year = 366 days (leap year)
= 365 1/4 days
1 decade = 10 years
1 score = 20 years
1 century = 100years
Weight
1 g = 1000 mg
1 kg = 1000 g = 2.205 lb
1 lb = 16 oz
Area
1 hectare = 10,000 m²
1 m² = (3.28ft)²
1 ft² = (12in)²
1 in² = (2.54cm)²
Volume
1 L = 1000 mL
1 gal = 3.785 L
1 cm³ = 1 mL
1 in³ = (2.54cm)³
1 ft³ = (12in)³
1 m³ = (3.28ft)³
1 yd³ = (3ft)³
Unit Circle (Degrees & Radians)
π = 3.1416
π radians = 180°
2π radians = 360° = 1 revolution
Angles
Right angle = 90°
Complementary angles = sum of 90°
Straight line = 180°
Supplementary angles = sum of 180°
Miscellaneous
1 baker's dozen = 13 pieces
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