Q: This is because the Arcsin function is undefined for arguments greater than 1 or less than -1. pi = 2 * (Arcsin(sqrt(1 - x^2)) + abs(Arcsin(x))).  Arcsin refers to the inverse sine in radians Sqrt is short for square root Abs is short for absolute value x^2 refers to an exponent, in this case, x squared.
A: Pick any number between -1 and 1. Plug your number into the following formula, and the result will be roughly equal to pi.

Article: Thick-skinned tomatoes are less likely to burst on the grill. These include Roma tomatoes, plum tomatoes, and crack resistant tomatoes. Avoid overripe, oozing tomatoes, which will drop juice and flesh through the grate. Remove excess water to shorten the grilling time and keep your tomatoes firm. Cut the tomatoes in half, then sprinkle salt on the cut sides. Place face down on a paper towel or cooking rack for 30 minutes.  Even if you don't wait the full 30 minutes, drain them while the grill is warming up. Don't try this with small tomatoes. You'll lose too many flavorful juices just cutting them open. . Tomatoes grill best over high heat. Set a gas grill to high at least 15 minutes before grilling. For a charcoal grill, wait until the coals are covered in ash and you can only keep your hand near the grate for three seconds or less.  Place the grate 4–5 inches (10–13cm) above the heat source. Close the lid of the gas grill on cool or windy days. Tomatoes taste great with just a drizzle of olive oil, but extra flavor is useful if they're the centerpiece of a dish. Here are a few delicious options:  Olive oil, salt, black pepper (or lemon pepper), garlic powder, ground habanero pepper. Go easy on the salt and pepper, to avoid overpowering the tomato flavor.  1 cup (240 mL) olive oil, ¼ cup (60 mL) white vinegar, ¼ cup (60 mL) sugar, and 1 tbsp (15 mL) anchovy paste. Add parsley once cooled, and top the tomatoes with feta. To turn a marinade into a crust, mash breadcrumbs into it until soggy. Top the tomato with blue cheese and cover with the breadcrumb marinade mixture.  Fresh basil, minced garlic, chopped fresh basil, and a pinch each of black pepper and salt. The best approach depends on the size and juiciness of your tomatoes. The goal is to stop the pulp from dripping out, and to make the tomatoes easy to handle. Here are your options:  Cut medium to large tomatoes in half for easy handling with a spatula. If you're using the "cheese crust" mentioned above, cut the top ¼ off medium or large tomatoes.  Skewer small tomatoes whole on two parallel skewers, for easy turning. Place small tomatoes in a grill basket. Preheat the basket on the grill for a few minutes. Wrap a mound of juicy tomatoes in aluminum foil, crimping tightly to seal in juices. (Brush with marinade first.) For best results, let the tomatoes soak in the marinade for at least twenty minutes. If you're planning ahead, they can soak in the fridge overnight.  If you're in a hurry, just brush the marinade onto the cut side of the tomatoes, or onto the whole surface if the tomatoes are uncut. You'll still get some flavor, and the oil will help prevent sticking on the grate. For extra flavor, let the tomatoes soak in the marinade for a couple hours, or even overnight. Place halved tomatoes cut side down on the grill, and leave them in place until ready. When grilling whole tomatoes, rotate whenever they start to drip. Keep a close eye on the tomatoes the whole time. Move them to a cooler spot on the grill if one of them bursts.  Use a metal spatula instead of tongs, to avoid mashing the tomatoes.  For the "cheese crust" method, grill with the cheese on top instead. Grill until the tomatoes shrivel and develop a few black spots. This usually takes 5–10 minutes, depending on tomato size and grill temperature.  When grilling foil-wrapped tomatoes, you can wait until they burst into a hot, caramelized mess. This takes about 18 minutes.  Optionally, paint on more marinade halfway through.
Question: What is a summary of what this article is about?
Choose tomatoes. Drain tomatoes (optional). Preheat the grill Make the marinade (optional). Decide how to cut the tomatoes. Let soak in marinade. Position the tomatoes. Grill until lightly charred.

Q: Use a bevel tool to cut the square off of the edge of your leather. This will keep the edges from rolling up over time. It is only necessary to bevel one side of the leather: the back side can remain flat. Pay special attention to any sharp corners on your leather piece. These will need to be beveled separately, creating a diagonal or cut corner. With your edges beveled, you can move on to adding whatever finish is appropriate for your leather. You can use a resist to keep it a particular area clear of the finish or to reduce the coloring. Just be sure to always use gloves when using dyes or finishes....unless you like your hands a different color!  Tandy sells excellent finishes in a variety of colors. To apply these, use a paper towel, wool dauber, or a natural or very old sponge (regular sponges contain a chemical that does not react well with the leather). You can also use dyes. There are dyes intended for leather, but some leathers can also be dyed with shoe polish! These should be applied in the same way as the finishes. Acrylic paint thinned with water works on leather, if you'd prefer a painted look. Just use a normal paint brush to apply it. This works better for smaller, detailed sections than larger ones. You'll want to smooth the beveled edges of your piece after dying it. You can use a special tool for this purpose but the cheaper option is to simply rub it with a paper towel or canvas cloth! This will make the edges look shiny and professional. If you plan on doing any stitching, you'll want to add a stitching groove to keep your stitches from being worn down over time. There is a tool for this purpose called a stitch groover. Once you've cut a channel into your leather where the stitching will go, use a pricking iron or overstitch wheel to lightly mark where your individual stitches will go. This will help create an even, professional look. Finally, punch the individual holes you marked using a piercing awl.  When buying an overstitch wheel or pricking iron, get a shorter one to start off with, as it will be more versatile and make it easier to turn corners. When starting a new stitching line or having to otherwise pick up the overstitch wheel to start again, place the first spoke down in the hole of the last section of the line. This will keep the stitches even. Before sewing, you'll want to add any other finishing touches that you know you'll need, like adding snaps. Be aware, however, that adding things like snaps is difficult and requires its own separate set of tools. Once that's done, add your stitching and you're basically done. Rub the whole surface with a cloth to get a nice, smooth final look. As a final measure, you can add a clear final finish on after doing your stitching, if you want to. This is not necessary, however. Enjoy your new creation and don't forget to keep practicing!
A:
Bevel the edges of your leather. Add finishes, dyes, or paint. Smooth the edges. Punch holes for stitching. Add other details. Add a clear finish if desired.