There is at least one for every note in the scaleand the savvy student will see that in some cases, there are two keys for the same note. For example, the key of G sounds exactly the same as the key of A! When playing the pianoand for the purposes of this article, the difference is academic. However, there are some composersespecially those that write for stringswho will suggest that the A is played a little "flatter" than the G. Here are the key signatures for the major scales: Keys not using sharps or flats: C Keys using sharps: G, D, A, E, B, F, C Keys using flats: F, B, E, A, D, G, C As you can see above, as you move through the sharp key signatures, you add sharps one at a time until every note is played sharp in the key of C. As you move through the flat key signatures, you add flats until every note is played flat in the key of C. It may be of some comfort to know that composers usually write in key signatures that are comfortable for the player to read. D major is a very common key for string instruments to play because the open strings are closely related to the tonic, D. There are few works out there that have strings play in E minor, or brass playing E major - it's as much a pain for them to write as it is for you to read.
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One-sentence summary -- Learn these key signatures.

Q: The formula for the area of a triangle is A=1/2bh. A = Area of the triangle b = Length of the base of the triangle h = Height of the base of the triangle You already know the area, so assign that value to A. You should also know the value of one side length; assign that value to "'b'". Any side of a triangle can be the base, regardless of how the triangle is drawn. To visualize this, just imagine rotating the triangle until the known side length is at the bottom. First multiply the base (b) by 1/2, then divide the area (A) by the product. The resulting value will be the height of your triangle!
A: Recall the formula for the area of a triangle. Look at your triangle and determine which variables you know. Plug your values into the equation A=1/2bh and do the math.

Article: Exposure to loud noises can trigger and worsen your symptoms. Wear protective ear plugs or muffs if you work in a noisy environment, when you use power tools, while doing yard work, when you vacuum, or when you perform any other noisy task. Regular cardiovascular exercise is especially helpful, so try walking, running, cycling, and swimming. In addition to benefiting your overall health, exercise can improve blood flow, which might help relieve forms of tinnitus linked to heart or blood circulation issues. Staying active is also good for your emotional health. If you don't exercise regularly, consult your doctor before starting a new exercise routine, especially if you have a history of any medical issues. Stress can aggravate tinnitus, so take deep breaths and relax if you start to feel anxious, worried, or overwhelmed. Count to 4 as you breathe in slowly, hold your breath for a 4 count, then count to 4 as you slowly exhale. Continue to control your breathing for 1 to 2 minutes, or until you feel at ease. Visualize relaxing scenery as you breathe, such as a beach or a calming childhood memory. Do your best to avoid stressful situations and people. If you have a lot on your plate, don't take on new responsibilities or stretch yourself too thin. Taking yoga or martial arts classes can also help promote mindfulness and relaxation. Taking a class adds a social component, which could improve your overall mindset. Try cutting back on alcohol, and limit your consumption of caffeinated coffee and tea, soft drinks, and chocolate. These substances can affect your blood flow and aggravate tinnitus. Nicotine is especially harmful, so ask your doctor for advice about quitting tobacco products, if necessary. Cutting back on caffeine is also helpful if you have trouble falling asleep due to tinnitus.
Question: What is a summary of what this article is about?
Limit your exposure to loud noises. Exercise for at least 30 minutes a day. Try meditation and relaxation techniques. Avoid caffeine, alcohol, and nicotine.