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Fig. 11.24 Using Heron's formula for the area of a triangle is very complicated, because it involves squaring twice to get rid of the square roots. Adding the single construction line is more plausible, but the simplest method of the three is the third. Figure 11.24 shows again the righthand diagram of Fig. 11.13. By the cosine formula applied to each of the small triangles,

H == E*

Data rate transfer exceeding 1 Mbps at any location within the cell where voice phones worked Wireless connected photographic cameras Wireless connected video cameras GPS information Windows operating system with Word, Excel, and PowerPoint Internet access

De ne a WLAN standard that includes both MAC and PHY functions De ne a high-speed (up to 54 Mbps) PHY supplement in the 5-GHz band De ne a high-speed (up to 11 Mbps) PHY extension in the 2.4-GHz band Operation in additional regulatory domains Enhance the original 802.11 MAC to support QoS (applies to 802.11a/b/g) De ne a recommended practice for interaccess point protocol (applies to 802.11a/b/g) De ne a higher rate (up to 54 Mbps) PHY extension in the 2.4-GHz band De ne MAC functions that allow 802.11a products to meet European regulatory requirements Enhance 802.11 MAC to provide improvement in security (applies to 802.11a/b/g) Enhance the current 802.11 MAC and 802.11a PHY to operate in Japanese 4.9-GHz and 5-GHz bands Enhance the 802.11a and 802.11 PHY to operate at data rates up to 600 Mbit/s Modify the 802.11a standard for car-to-car communications Provide a protocol for autocon guring mesh networks Provide data integrity and authentication

desktop. All of the capabilities of the Live Mesh, today and in the future, will work identically via each entry point. Note, too, that Microsoft also supports non-Microsoft PCs (for example, Macs) and mobile devices (for example, Windows Mobile smartphones) with this platform. The Live Mesh Web-based desktop is shown in Figure 23-27. In short, Microsoft is creating a cloud computing platform in which the PC is but a component. Like it or not, most computer users today don t typically use just a single device. People increasingly use multiple PCs (and/or Macs), both in the home and at work. They have desktops and laptop computers; they have smartphones, MP3 players, digital cameras, and other mobile devices. In addition, most users have a host of online personas via e-mail and instant messaging services, social networking memberships, e-commerce sites, and other online communities. Users manage these disparate components separately and with great complexity and difficulty.

10. Connect the biggest power connector to the motherboard. This step is the opposite of step 3. Push until the connector is firmly seated; on most PCs you ll hear a click as the tab locks into place. 11. Put the cover back on the PC. 12. Reconnect the keyboard, mouse, display, and any other peripheral cables. 13. Power up the PC and run it for several hours, if possible, to make sure heat buildup isn t a problem with the new unit. Listen for the fan to make sure it s working; if it s not, shut the PC off immediately and either replace the fan or get a different power supply. Make sure the PC can access all internal devices: disk drives, CD-ROM drive, diskette drive, and so on.

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