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In order to calculate the interior angles of a polygon, you need to first determine how many sides the polygon has. Note that a polygon has the same number of sides as it has angles. For instance, a triangle has 3 sides and 3 interior angles while a square has 4 sides and 4 interior angles. The formula for finding the total measure of all interior angles in a polygon is: (n 2) x 180. In this case, n is the number of sides the polygon has. Some common polygon total angle measures are as follows: The angles in a triangle (a 3-sided polygon) total 180 degrees. The angles in a quadrilateral (a 4-sided polygon) total 360 degrees. The angles in a pentagon (a 5-sided polygon) total 540 degrees. The angles in a hexagon (a 6-sided polygon) total 720 degrees. The angles in an octagon (an 8-sided polygon) total 1080 degrees. A regular polygon is a polygon whose sides are all the same length and whose angles all have the same measure. For instance, the measure of each angle in an equilateral triangle is 180 3, or 60 degrees, and the measure of each angle in a square is 360 4, or 90 degrees. Equilateral triangles and squares are examples of regular polygons, while the Pentagon in Washington, D.C. is an example of a regular pentagon and a stop sign is an example of a regular octagon. If your polygon doesn't have sides of the same length and angles of the same measure, all you need to do is add up all of the known angles in the polygon. Then, subtract that number from the total measure of all of the angles to find the missing angle. For example, if you know that 4 of the angles in a pentagon measure 80, 100, 120, and 140 degrees, add the numbers together to get a sum of 440. Then, subtract this sum from the total angle measure for a pentagon, which is 540 degrees: 540 440 = 100 degrees. So, the missing angle is 100 degrees.

summary: Count the number of sides in the polygon. Find the total measure of all of the interior angles in the polygon. Divide the total measure of all of a regular polygon's angles by the number of its angles. Subtract the sum of the known angles from the total measure of the angles for an irregular polygon.

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It's going to be easy to get down about missing prom if you don't have anything to look forward to. Commit to engaging in your favorite hobby every day after school or work for the next couple of weeks. Even when you don't want to do it, set a goal to do something fun every day. Whether it's video games, basketball, art, or card games, you're going to feel better if you have something to look forward to. If you don't have any hobbies that excite you, now is the perfect time to pick a new one up! Ask your family or friends for suggestions by seeing what they like to do in their spare time. Turn notifications off and uninstall Instagram and Facebook, at least for the time being. There are going to be a lot of photos and status updates related to prom, and seeing that stuff will make you feel like you really missed out. Avoid spending too much time online to ensure that you don't get bogged down by other people's experiences. It may sound silly, but making a list of things you enjoy is actually a really simple way to boost your self-esteem. Gratitude will make you happier, and feeling good about what you do have, instead of feeling sorry about what you're missing, is an excellent way to bring yourself back from a bad mood. If you're out and about and can't sit down to make a list, make one in your head or say it out loud. Simply listing things that you appreciate will lift your mood. You don't need to focus on big things to be appreciative! Popping bubble wrap, the smell of grass after it rains, and a new pair of shoes are all cause for celebration.

summary: Do something that you enjoy every day to avoid feeling sorry for yourself. Stay off of social media and avoid looking at your phone. Make a list of things that you're thankful for.

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The three most common contracts that may need a guarantor are mortgages, residential rentals, and credit cards. Each type of guarantor agreement may have different requirements. On a mortgage, the guarantor is part of the mortgage process. Your guarantor will have to disclose his assets, income, and debts, as well as undergo a credit check. The mortgage company wants a guarantor that can pay for his own rent or mortgage and be able to assume yours if you default. More and more landlords are asking for guarantors on residential rentals. This is especially true in high cost of living areas like New York City. A landlord is going to want a guarantor who lives close and has a sufficient income to cover the rent payments if you default. On a credit card application, the card issuer is going to look at the guarantor's income and credit rating. In short, the credit card will be in your name, but it will be granted on the strength of your guarantor's credentials. Parents often act as guarantors on credit cards issued to applicants that are under 21. There are three ways to have someone act as security for your contract. Besides having a guarantor, you can also have someone act as a co-signer or joint applicant. The lender or landlord will usually have the last say, but it is worth it to you to ask if you have other options than a guarantor. A co-signer also agrees to pay the loan if you default. On a mortgage, a co-signer will be listed as a joint owner of the property until the mortgage is paid off. On a credit card or money loan, the co-signer is liable for the debt, but can't make charges. The main difference between a guarantor and a co-signer is that the lender must exhaust every possibility of collecting against you before they can sue a guarantor. A co-signer has less protection against liability and can be sued immediately. With a joint applicant, you can often pool your assets with another person, usually a spouse, partner, family member, or roommate to meet the requirements for the contract. A joint applicant is someone who will have the same rights as you as far as the property, rental, or charge account. In this type of agreement, the liability is usually equal. Both parties are responsible for the entire debt. When someone agrees to be your guarantor, he is trusting you to fulfill the contract. If you default, the consequences to your guarantor can be devastating. Before you ask someone to underwrite your contract, you need to have a contingency plan in case you run into trouble. Keep your guarantor up to date on your financial condition. If you are beginning to struggle, it is critical that you be honest. You may need to move or ask for help with mortgage or credit card payments until you can get back on your feet. Be prepared to release your guarantor as soon as possible. When a new job starts paying off or old debts are paid, you will usually see your credit score and cash flow increase. On a credit card, it can often be as simple as a joint phone call. On a mortgage or contract, it may require refinancing the agreement or rewriting the lease. Your guarantor has legal rights against you. He is entitled to copies of all documents regarding the transaction and to check if you are paying your bills as promised. This is only fair. If you default, the lender will be very aggressive in their actions against your guarantor. If this happens, your guarantor has the right to sue you to recover his losses if you default on the agreement.
summary: Decide what type of contract you are seeking. Research your options. Prepare a contingency plan. Understand your legal responsibilities.