History [edit]. In 1938, polytetrafluoroethylene (DuPont brand name Teflon) was discovered by accident by a recently hired DuPont Ph.D., Roy J. Plunkett. While working with tetrafluoroethylene gas, he noticed that a previously-pressurized cylinder had no pressure remaining.
Triangle Sides Calculator. This calculator calculates for the length of one side of a right triangle given the length of the other two sides. A right triangle has two sides perpendicular to each other. Sides a and b are the perpendicular sides and side c is the hypothenuse. Enter the length of any two sides and leave the side to be calculated blank. Please check out also the Regular Triangle Calculator and the Irregular Triangle Calculator.
Actually,   Regular Triangles   1 Use the Pythagorean theorem for right triangles in which two sidesâ¦ are given. (This theorem is A^2 + B^2 = C^2. A and B are regular sides, and C is the hypotenuse.) If you're trying to find the hypotenuse, square the other sides, add them together and take the square root.