6,371km => earth radius
14,433 ft => Mt Elbert, highest in Colorado
-273 Celsius => 0 Kelvin, lowest temperature possible
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US Imperial System
Linear
| 12 inches | = | 1 foot |
| 3 feet | = | 1 yard |
| 5.5 yards | = | 1 rod |
| 40 rods | = | 1 furlong |
| 8 furlongs | = | 1 mile |
| 3 miles | = | 1 league |
| 1 mile = 8 * 40 * 5.5 * 3 = 5280 ft |
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Area
| 144 sq. inches | = | 1 sq. foot |
| 9 sq. feet | = | 1 sq. yard |
| 30.25 sq yards | = | 1 sq. rod |
| 160 sq. rods | = | 1 acre |
| 640 acres | = | 1 sq. mile |
| 1 sq. mile | = | 1 section |
| 36 sections | = | 1 township |
1 acre = 160 * 30.25 = 4840 sq. yards
or a 70x70 yards square |
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Liquid
| 2 cups | = | 1 pint |
| 2 pints | = | 1 quart |
| 4 quarts | = | 1 gallon |
Kitchen
| 3 tsp. | = | 1 tbsp. |
| 4 tbsp. | = | 1/4 cup |
| 16 tbsp. | = | 1 cup |
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Metric System
Area
| 10,000 sq. centimeters | = | 1 sq. meter |
| 100 sq. meters | = | 1 are (a) |
| 100 ares | = | 1 hectare (ha) |
| 100 hectares | = | 1 sq. kilometer |
1 hectare = 100 * 100 = 10,000 sq. meters or a 100x100 meters square |
| | 1,000 kilograms = 1 metric ton |
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