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  2. Orders of magnitude (area) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(area)

    1 square millimetre (mm 2) 1–2 mm 2: Area of a human fovea [17] 2 mm 2: Area of the head of a pin: 10 −5 30–50 mm 2: Area of a 6–8 mm hole punched in a piece of paper by a hole punch [18] 10 −4: 1 square centimetre (cm 2) 290 mm 2: Area of one side of a U.S. penny [19] [20] 500 mm 2: Area of a typical postage stamp: 10 −3 1,100 mm 2 ...

  3. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It is equal to π /4 square mils or approximately 5.067 × 10 −4 mm 2. It is a unit intended for referring to the area of a wire with a circular cross section.

  4. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    3.1 Calculate the factor. 3.2 Calculate the numbers. 4 Software tools. ... Unit conversion is often easier within a metric system such as the SI than in others, ...

  5. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    The barn (b) is a unit of area used in nuclear physics equal to one hundred femtometres squared (100 fm 2 = 10 −28 m 2). The are (a) is a unit of area equal to 100 m 2. The decare (daa) is a unit of area equal to 1000 m 2. The hectare (ha) is a unit of area equal to 10 000 m 2 (0.01 km 2).

  6. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    Here the metric prefix 'kilo-' (symbol 'k') stands for a factor of 1000; thus, 1 km = 1000 m. The SI provides twenty-four metric prefixes that signify decimal powers ranging from 10 −30 to 10 30, the most recent being adopted in 2022.

  7. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    Suppose that the area C enclosed by the circle is greater than the area T = cr/2 of the triangle. Let E denote the excess amount. Inscribe a square in the circle, so that its four corners lie on the circle. Between the square and the circle are four segments. If the total area of those gaps, G 4, is greater than E, split each arc in

  8. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    The are was the original unit of area in the metric system, with: 1 are = 100 square metres; Though the are has fallen out of use, the hectare is still commonly used to measure land: [13] 1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres; Other uncommon metric units of area include the tetrad, the hectad, and the myriad.

  9. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    A metric ounce is an approximation of the imperial ounce, US dry ounce, or US fluid ounce. These three customary units vary. However, the metric ounce is usually taken as 25 or 30 ml (0.88 or 1.06 imp fl oz; 0.85 or 1.01 US fl oz) when volume is being measured, or in grams when mass is being measured.