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  2. Microsoft Product Activation - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Product_Activation

    In Windows 7 and later, significant hardware changes (e.g. motherboard) may require a re-activation. In Windows 10 and 11, a user can run the Activation Troubleshooter if the user has changed hardware on their device recently. If the hardware has changed again after activation, they must wait 30 days before running the troubleshooter again.

  3. Hectare - Wikipedia

    en.wikipedia.org/wiki/Hectare

    Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one square mile.. The hectare (/ ˈ h ɛ k t ɛər,-t ɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land.

  4. Product activation - Wikipedia

    en.wikipedia.org/wiki/Product_activation

    Product activation is a license validation procedure required by some proprietary software programs. Product activation prevents unlimited free use of copied or replicated software. Unactivated software refuses to fully function until it determines whether it is authorized to fully function. Activation allows the software to stop blocking its use.

  5. HP-67/97 - Wikipedia

    en.wikipedia.org/wiki/HP-67/97

    height: 0.7–1.4 inches (18–36 mm) The HP-67 is a magnetic card-programmable handheld calculator , introduced by Hewlett-Packard in 1976 at an MSRP of $450. [ 1 ] A desktop version with built-in thermal printer was sold as the HP-97 at a price of $750. [ 2 ]

  6. Windows Calculator - Wikipedia

    en.wikipedia.org/wiki/Windows_Calculator

    A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

  7. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    One acre equals 1 ⁄ 640 (0.0015625) square mile, 4,840 square yards, 43,560 square feet, [2] or about 4,047 square metres (0.4047 hectares) (see below).While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based.

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  9. Orders of magnitude (area) - Wikipedia

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

    1 tera square meter T(m 2) 1 square megametre (Mm 2) 1.0 Mm 2: Egypt (country ranked 29th by area) [73] 2 Mm 2: Mexico: 3.10 Mm 2: Sakha (Yakutia) Republic in Russia (largest subnational governing body) [74] 3.28 Mm 2: India (country ranked 7th by area) 5 Mm 2: Largest extent of the Roman Empire [75] [76] 7.74 Mm 2: Australia (country ranked ...