In one sentence, describe what the following article is about: The formula is Asector=360()(r2){\displaystyle A_{sector}={
rac { heta }{360}}(\pi )(r^{2})}, where Asector{\displaystyle A_{sector}} equals the area of the sector, {\displaystyle heta } equals the central angle of the sector in degrees, and r{\displaystyle r} equals the radius of the circle. This information should be given to you. Make sure you have the area of the sector, not the area for the circle. Substitute the area for the variable Asector{\displaystyle A_{sector}} and the angle for the variable {\displaystyle heta }. This will tell you what fraction of the entire circle the sector represents. To do this, divide both sides of the equation by the fraction or decimal you just calculated. This will isolate the r{\displaystyle r} variable. For a more precise result, use a calculator. You can also round {\displaystyle \pi } to 3.14. This will give you the radius of the circle.
Summary: Set up the formula for the area of a sector. Plug the sector's area and central angle into the formula. Divide the central angle by 360. Isolate ()(r2){\displaystyle (\pi )(r^{2})}. Divide both sides of the equation by {\displaystyle \pi }. Take the square root of both sides.

The vestibular system contributes to balance and sense of spatial orientation. Vestibular exercises help to calm the child down using swinging or rocking motions. Repetitive motions sooth and refocus the child's attention on their physical sensation. Place the child in a swing and gently push them. Adjust the swinging speed, slowing down or speeding up, until your child is calm. If swinging seems to make things worse, stop. It may be a good idea to install an indoor swing to best incorporate technique. This can be accessed no matter what the weather is. Some children can swing themselves. In this case, gently suggest they go to their swing. Spinning is a stimulating vestibular exercise. This activity will likely stop a meltdown by diverting attention from the trigger and redirecting it to physical sensation. Office chairs tend to work best because they swivel easily. Make sure the child is firmly seated and spin the chair slowly to avoid injury. Some children will prefer to leave their eyes open, while others may close them.
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One-sentence summary -- Understand how vestibular stimulation exercises work. Swing back and forth. Twirl the child in a chair.

Q: It is important to keep your skin clean. You should use a mild cleanser, or a cleanser designed for sensitive skin to clean the area. You can shower or bathe as normal, just make sure to keep the water temperature cool. You can wash the treated area 1-2 times a day after the treatment. If you wash more frequently, you may increase the redness or discomfort. After 2-3 days, if the redness has disappeared, you can return to your normal skin routine. After laser hair removal, your skin will be more sensitive than normal. It will also probably feel dry, especially as it heals. Applying a moisturizer designed for sensitive skin to the treated area will alleviate the dry feeling without causing further irritation. After the initial treatment, you can apply moisturizer 2-3 times a day as needed. Just be careful to apply it gently; don't irritate the treated area by rubbing too vigorously. Use a non-comedogenic moisturizer. This will help keep the pores clear and promote healing. If you had hair removed from your face, makeup should not be applied as it may irritate the skin further. It is best to use as little product as possible on your face after treatment. After 24 hours, if the redness is gone, makeup can be applied. You should also avoid topical facial medications such as anti-acne creams. After 24 hours, if the redness has disappeared, you can start using these products again.
A: Clean the treated area with a mild cleanser. Pick a moisturizer designed for sensitive skin. Avoid makeup and harsh skin products.

Problem: Article: In the winter, with harsh winds and heating on full-blast, most skin types will dry out quickly. Drink plenty of water and apply oil-free, easily absorbed light lotions to all parts of your body. Use lip balm to keep from suffering from chapped lips. Though showering daily is considered good hygiene, many have found that they should wash their hair using products every other day, or even less! The reasoning behind this is simple: washing your hair strips it of it's natural oils, causing it to dry out and split ends to form - a problem amplified by the winter. Leave in a moisturizing conditioner or hair mask on the last 3 to 5 inches (7.6 to 12.7cm) of your hair for about 15 minutes, once a week in order to keep it soft. Also, brush hair from the scalp to the tips, to spread the natural oils. This does nothing but strengthen your hair and give it a silky feel. For the face, lighten or forgo foundation completely, and use a rosy, warm pink on your cheeks. Mixing a tiny dusting of bronzer with your blush can be a good maneuver, but either look lovely. Consider "going bare" at the eyes; a quick layer of charcoal mascara on your upper lashes, and no eyeliner. This serves to brighten and enlarge your eyes. Cream eye-shadows are also good winter choices: unlike during the summer, they will not "melt off". Colors in the pale blues, whites, and gray-blues are lovely ways to adjust your makeup to the cooler months - daub a bit of white toward the inner corner of your eye, and blend outward with a light blue. Alternatively, jumbo eye-pencils in metallics are another option. Use whites, golds or silvers to achieve a frosty beauty with a tapering line barely above the top lashes. Lightly apply to the bottom of the eyes, then, using the sides of your index fingers, push up until it is a thin line. Use chapstick religiously. Apply every ten to twenty minutes, or as needed. Cracked lips are unattractive. Any kind will suffice, in a pinch, even Vaseline. It is light and leaves your lips feeling much softer. Natural beauty is never beaten. Very rarely does anything top a quick daub of lip-gloss and a freshly washed face.
Summary:
Care for your skin. Maintain your hair. Use a different makeup palette. Contrast warm cheeks by using a cooler lip and eye scheme. Use chapstick.