If a triangle has sides measuring 3, 4, and 5 feet (or any other unit), it must be a right triangle with a 90º angle between the short sides. If you can "find" this triangle in your corner, you know the corner is square. This is based on the Pythagorean Theorem from geometry: A2 + B2 = C2 for a right triangle. C is the longest side (hypotenuse) and A and B are the two shorter "legs." 3-4-5 is a very convenient measurement to check because of the low, whole numbers. The math checks out: 32 + 42 = 9 + 16 = 25 = 52. You can use feet, meters, or any other unit. Draw a mark at the end of three units. You can multiply each number by the same amount and still use this. Try 30-40-50 centimeters if using the metric system. For a large room, use 6-8-10 or 9-12-15 feet or meters. Using the same unit, measure along the second side, at – hopefully – a 90º angle to the first. Mark this point at four units. If the distance is 5 units, your corner is square.  If the distance is less than 5 units, your corner is less than 90º. Move the sides apart. If the distance is over 5 units, your corner has a measurement of more than 90º. Bring the sides closer together. You can use a framing square as a guide when you do this. Once you’ve got a square corner, you can check the room’s other three corners to ensure they’re the same.

Summary: Understand the 3-4-5 method. Measure three units from the corner along one side. Measure four units along the other side. Measure the distance between your marks.


For any Steam issue that you’re having that’s not unlocking your account, go to the Steam support home page. Sign in using your Steam Account name and password by clicking the box on the left that says “Sign into Steam.” After you enter your name and password, click “login.” If you have never submitted a ticket for support help, click “Create account” in the upper right corner of the screen to make a support account. This account is different than your regular Steam account, so you don’t already have one unless you have specifically contacted Steam support in the past. If you have submitted a ticket to Steam support in the past, you can log in to your existing support account by clicking “Sign in to your support account” in the upper right corner of the screen. The next page allows you to choose if your problem is with a “Game” or with “Steam.” Select Steam to view some troubleshooting articles under topics including account issues, billing, how-to’s, and a Steam glossary. Try browsing the articles posted to see if your question can be answered without you sending a ticket to support. If browsing articles doesn’t answer your question, you can submit a ticket describing your problem directly to a support person. Clicking “Contact Steam Support” will bring you to the page where you submit a ticket. The “Contact Steam Support” button is on the right of the page, underneath “Can’t find the solution?” The ticket page has 2 boxes where you type the subject of your problem, and then your question. Be as specific as possible when describing your problem so the person reading it can help you the best they can.  For instance, if you are having trouble trading games and got a message in your account saying your trading privileges were removed, type something like “Account is trade banned” in the subject. Then explain the messages you are getting and things you cannot do in the large question box. Remember to be polite when asking your questions, since the support person reading them would like to help you the best they can. The rest of the page has questions that prompt you to choose an answer from a drop-down menu: Language, Your Email Address, Product, Category, Additional Information, and Operating System. Choose an answer from each menu that most applies to you.  If your email address has been compromised and that is part of the problem you’re reporting, click “Add Alternate Email Address” under the Your Email Address drop-down menu to provide Steam with a new address to reach you. You may have to provide a CD Key if you have never connected a method of payment to your account. This information should be available to you in previous emails from Steam. When you have competed the ticket page, submit your question by clicking the green “Submit Question” box at the bottom of the screen. The Steam support team should respond to your ticket via email in the next couple of business days.

Summary: Sign into your Steam account at https://help.steampowered.com/en/. Create a support account if you don’t already have one. Choose “Steam” to get to the Steam section of support. Click “Contact Steam Support” to submit a ticket to Steam support. Fill in all boxes on the Ask a Question page. Select answers for the other drop-down menu boxes on the page. Click “Submit Question” at the bottom of the page when you’re finished.


If your oximeter is battery-powered, be sure to keep it charged. That way if you need it in a hurry, it will be ready for use right away. Inevitably your oximeter will get dirty from use. Keeping the probe clean is important for two reasons. First, dirt and dust can block light emitted by the oximeter and lead to inaccurate readings. Second, buildup of microorganisms on the probe can cause an infection when you put it on.  Use a lightly damp cloth or paper towel to wipe away dirt. Use an alcohol swab to kill bacteria and viruses. Make sure your oximeter is somewhere it won't get knocked over and damaged. If your oximeter is the plug-in type, make sure all plugs are out of the way and won't be tripped over. When unplugging a cable, you should always grab the plug itself, never the wire. This could damage the internal wiring and lead to a fire hazard.
Summary: Keep the battery charged at all times. Clean the probe section of the oximeter. Store your oximeter in a safe place. Disconnect all wires properly.