A frame has 4 basic frame sizes ( eye, bridge, temple, vertical 1  ): Eye Size - refers to the horizontal width in millimeters of one of the frame's lenses. 2  Bridge Size - measurement is the distance in millimeters between the two lenses. It is measured between the two closest points of the two lenses.
The Extra Long Cot is quality made and ready for camping, the beach, or traveling. Weighing only 12 pounds, the cot is 84 long (that's 7' long!), 32 wide and 9 off the ground. The cot folds up to 36 x 7 x 4and fits into a carrying bag (with a carrying strap) that is included in your purchase. The green polyester cover is washable and mildew resistant.
In a right triangle, the cotangent of an angle is the length of the adjacent side divided by the length of the opposite side. In a formula, it is abbreviated to just 'cot'. Of the six possible trigonometric functions, cotangent, secant, and cosecant, are rarely used. In fact, most calculators have no button for them, and software function libraries do not include them. They can be easily replaced with derivations of the more common three: sin, cos and tan. Cotangent can be derived in two ways: The inverse cotangent function - arccot. For every trigonometry function such as cot, there is an inverse function that works in reverse. These inverse functions have the same name but with 'arc' in front. So the inverse of cot is arccot etc. When we see arccot A, we interpret it as the angle whose cotangent is A.