The region enclosed by the circle at the bottom of the cylinder is your bottom base surface (B). A radius is any line segment that runs from a circle’s center to its perimeter. To find the radius, simply measure from the mid-point of the cylinder’s bottom to the outside of the circle. A diameter is any straight line segment that passes through the center of the circle and has endpoints on the circle’s perimeter. For any circle, the diameter will be twice the radius. Therefore, you can also find the radius of the circle at the bottom of the cylinder by measuring the complete radius and dividing that number in half. Once you know the radius of your bottom base surface (B), you can calculate the area. To do so, use the formula B = πr2, using your radius as r and 3.14159 for π, which is a mathematical constant. You can now determine the total volume of the tank by multiplying the area by the length of the tank. The full formula for total volume of the tank is Vtank = πr2h. The filled volume is just a shorter cylinder with the same radius but a different height: the fill height, d. Therefore: 𝑉 = π𝑟2h.
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One-sentence summary -- Measure the radius of the circle at the bottom of the cylinder. Find the area of the circle at the bottom of the cylinder. Calculate the total volume of a cylinder tank. Determine the filled volume.

Q: The End boss is called the Ender Dragon. She (yes, she was officially confirmed to be female) flies around the End skies. You must kill her to beat the game.  Watch out for Endermen, they spawn heavily in this dimension. Saving, exiting, and reloading while in the End, if you have not yet killed the dragon, will cause a second dragon to spawn. Make sure you have enough time to finish the battle. She may take a moment to appear, so take this time to prepare, by sorting your inventory and such. You may spawn underground. If this is the case, just dig your way out. These crystals, located atop the obsidian towers in the End, heal the Ender Dragon. You can destroy them with any attack, including a snowball. Using a close-range weapon is not recommended, since the crystals explode when hit. Some crystals are defended by iron bars. You can damage the dragon using a sword, bow and arrows, or explosive items. The dragon is immune to lava, fire, and splash potions, but potions that buff your stats are very useful.  Since trying to sleep in the End or Nether results in an explosion, you can use beds to damage the ender dragon. Just place it in front of you, stand back, and then try to sleep when the dragon comes close. In Computer Edition, the dragon is invulnerable to arrows while it is perched on top of the  portal. The Enderdragon drops up to 70 levels of XP, and opens the exit portal.  Now you have "beaten Minecraft," you'll spawn in your world's normal spawn after the credits, with all of your gear and a large number of extra experience levels!  You can go back to the End whenever you want now, provided you can reach the portal. Several valuable things can be found there, such as the Endermen and their valuable Ender Pearls, and the Obsidian and End Stone blocks, which are some of the most blast-resistant blocks in the game that you can use. The 1.9 update to the Java Edition (known as the Combat Update) added End Cities and End Ships.
A: Get ready to fight the boss. Locate the dragon. Destroy the Ender Crystals. Kill the dragon. Collect the loot. Jump into the exit portal. Beat the Game!

Article: Find a tub or basin large enough for your blanket to fit in and fill it up with cool water. Mix in mild detergent and let it spread through the water. You'll essentially be doing the same thing as a washing machine on a gentle setting, only manually, which gives you greater control over how the blanket is treated and helps ensure that every part gets clean. Don't fill the tub up too much or it may overflow when you put the blanket in. Using soft, kneading strokes, drag the blanket back and forth in the soapy water. It's best to take hold of one section of the blanket for a few passes, then smooth it out and wash a new section. Do this until the blanket has been cleaned thoroughly. Take the blanket out of the tub and let the saturated water run out. Fold the blanket in half two or three times and then use both hands to apply pressure to the blanket, squeezing out excess water. Pressing the blanket is a safer alternative to wringing it out, which can stretch the fabric out of shape. Give the blanket another quick wash in some plain cool water. This will rinse away any detergent that might have soaked into the blanket. Swish the blanket through the water, touching each section individually. Make sure there are no traces of soap remaining on the blanket.  Drain and refill the tub with fresh water until it remains clear after rinsing. You may need to do this several times. Make sure you hand wash delicate fabrics like wool, silk and linens. These fabrics are woven from natural fibers and may be irreparably damaged if treated with harsh washing methods.
Question: What is a summary of what this article is about?
Fill a tub with cool water and add detergent. Swish the blanket through the water. Press out excess water. Wash again using plain water.