GUATEMALA CITY - Torrential rains brought by the first tropical storm of the 2010 season pounded Central America and southern Mexico, triggering deadly landslides. The death toll stood at 15 Sunday but authorities said the number could rise.
Archimedes proved the formula for the area of a circle (A = Ï r 2, where r is the radius of the circle) and showed that the value of Ï lay between 3 + 1/7 (approximately 3.1429) and 3 + 10/71 (approximately 3.1408).
1. Know what the unit circle is. The unit circle is a circle, centered at the origin, with a radius of 1. Recall from conics that the equation is x 2 +y 2 =1. This circle can be used to find certain special trigonometric ratios as well as aid in graphing.ecall that there is a real number line wrapped around the unit circle. The point on the number line refers to the number of radians in the angle formed. For instance The point at Ï/2 on the real number line corresponds with the point on the circle whose radius forms an angle of Ï/2 with the positive horizontal radius.