Q: The formula for the surface area of any prism is SA=2B+Ph{\displaystyle SA=2B+Ph}, where SA{\displaystyle SA} equals the surface area, B{\displaystyle B} equals the area of the base, P{\displaystyle P} equals the perimeter of the base, and h{\displaystyle h} equals the height of the prism. In order for this method to work you must know the surface area of the prism, as well as the area of the triangular base, and the length of all three sides of the base. If you do not know the surface area, this method will not work. For example, if you know the surface area is 1460 square centimeters, your formula will look like this:1460=2B+Ph{\displaystyle 1460=2B+Ph} To find the area, you need to know the length of the triangle's base and the height of the triangle. Use the formula A=12(b)(h){\displaystyle A={
rac {1}{2}}(b)(h)}. To find the area of a triangle. Alternatively, if you know the length of all three sides of a triangle, you can find the area using Heron's formula. Read Calculate the Area of a Triangle for complete instructions. For example, if the base of the triangle is 8 centimeters, and the height of the triangle is 4 centimeters, to find the area you would calculate:A=12(8)(4){\displaystyle A={
rac {1}{2}}(8)(4)}A=12(32){\displaystyle A={
rac {1}{2}}(32)}A=16{\displaystyle A=16} Make sure you are substituting for the letter B{\displaystyle B}. For example, if you found the area of the base to be 16, your formula will look like this:1460=2(16)+Ph{\displaystyle 1460=2(16)+Ph}1460=32+Ph{\displaystyle 1460=32+Ph} To find the perimeter of a triangle, add up the length of all three sides. For example, if the base is a triangle has three sides with lengths of 8, 4, and 9 centimeters, to find the perimeter you would calculate:P=8+4+9{\displaystyle P=8+4+9}P=21{\displaystyle P=21} Make sure you are substituting for the letter P{\displaystyle P}. For example, if you found the perimeter of the base to be 21, your formula will look like this:1460=32+21h{\displaystyle 1460=32+21h} This will give you the height of your prism. For example, if your equation is 1460=32+21h{\displaystyle 1460=32+21h}, you would first need to subtract 32 from each side, then divide each side by 21. Thus:1460=32+21h{\displaystyle 1460=32+21h}1428=21h{\displaystyle 1428=21h}142821=21h21{\displaystyle {
rac {1428}{21}}={
rac {21h}{21}}}68=h{\displaystyle 68=h} So, the height of your prism is 68 centimeters.
A: Set up the formula for the surface area of a prism. Plug the surface area of the prism into the formula. Find the area of the base. Plug the area of the base into the formula for the surface area of a prism and simplify. Find the perimeter of the base. Plug the perimeter of the base into the formula for the surface area of a prism. Solve the equation for h{\displaystyle h}.

Q: Calculating leap years requires having a year that you want to check. Use a past year, the current year, or a future year as your starting point. For example, you could start by checking 1997 or 2012 if you want to look at a past year, or go with 2019 to check the current year, or select 2025 or 2028 to check a future year. Dividing the year by 4 will result in a whole number with no remainder if the number is evenly divisible. The number must be evenly divisible by 4! Otherwise, it is not a leap year. For example, dividing 1997 by 4 gives you 499.25, which is not a whole number because it ends with a decimal. Therefore, it is not a leap year. When you divide 2012 by 4, you get 503, which is a whole number. This means that 2012 is likely a leap year. If a year is evenly divisible by 4, but it is not evenly divisible 100, then it is a leap year. If a year is divisible by both 4 and 100, then it might not be a leap year, and you will have to perform 1 more calculation to check. For example, 2012 is evenly divisible by 4, but not 100 since it results in a decimal answer (20.12). This means that 2012 is definitely a leap year. 2000 is divisible by 4 and it is also evenly divisible by 100 since it leaves a result of 20. That means that 2000 might not be a leap year and you will have to divide it 1 more time. If a year is divisible by 100, but not 400, then it is not a leap year. If a year is divisible by both 100 and 400, then it is a leap year. For example, 1900 is evenly divisible by 100, but not 400 since it gives you a result of 4.75. This means that 1900 is not a leap year. On the other hand, 2000 is evenly divisible by 100 and 400, since it gives you a result of 5. That means that the year 2000 is a leap year.
A: Identify the year you want to check. See if the number is evenly divisible by 4. Confirm the number isn't evenly divisible by 100. Check if the number is evenly divisible by 400 to confirm a leap year.

Q: Avoid cleaning your roof in direct sunlight. Keep in mind that metal and light-colored paint will reflect sunlight and create glare, which may drastically reduce your vision. If the layout of your roof requires you to climb onto it, do so when it's dry out to reduce the risk of slipping. Of course, once you start washing your roof, it will get wet and pose a risk. However, it's still a smart idea to reduce that risk as much as possible. Before you haul all of your gear up, set up your ladder. Climb onto the roof and judge your ability to reach all of its parts. If you feel that certain parts are too precarious for you to safely reach, err on the side of caution and do not attempt to clean it. Keep in mind that your power washer or hose will extend your reach considerably. If any out-of-reach areas look like they need scrubbing afterward, hire a professional to do so. Do not attempt to wash your roof alone. Whether you need to mount the roof itself or can do the job from a ladder, play it safe. Ask someone to spot you so they can: Assist you in bringing gear up and down. Alert you to any hazards that you may not be aware of. Call for help in the event of an accident. Protect yourself from a fall. Wear a safety harness. Attach a safety line between that and a sturdy feature of your roof (like a chimney). If none are available, use either a: Bolt-strap anchor for corrugated roofs. Ridge clamp for standing-seam roofs.
A:
Wait for dry weather and overcast skies. Clean only those areas that are easily reached. Have a partner. Secure yourself.