T. rex's serrated, cone-shaped teeth were most likely used to pierce and grip flesh. Its two-fingered forearms could probably seize prey, but they were too short to reach its mouth. Scientists believe this powerful predator could eat up to 500 pounds (230 kilograms) of meat in one bite.
Angles and distances are measured from the total station to points under survey, and the coordinates (X, Y, and Z or easting, northing and elevation) of surveyed points relative to the total station position are calculated using trigonometry and triangulation.
If one has a right angle, and knows at least one other angle, he subtracts it from 90 to get the other angle. Here's another way to measure angles: use the fist! If one makes a fist, and extends the arm straight, the area covered by the fist equals 10 degrees. One can make rough estimates of angular elevation in this way when hiking or looking at the night sky.