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It means "angle angle side". It usually refers to a triangle. You are given two angles and a side and must use that information to figure out the values of the other angle, and the other two sides.
The world's combined continental slope is about 200,000 mi (300,000 km) long and descends at an average angle of about 4° from the edge of the continental shelf to the beginning of the ocean basins at depths of 330 - 10,500 ft (100 - 3,200 m). The slope is most gradual off stable coasts without major rivers and is steepest off coasts with young mountain ranges and narrow continental shelves. Slopes off mountainous coastlines and narrow shelves commonly have outcrops of rock. The dominant sediments of continental slopes are muds; there are smaller amounts of sediments of sand or gravel.
A heap of sand or hill naturally forms in a conical shape due to the principle of angle of repose. The angle of repose is the steepest angle at which a material can be piled without slumping. In the case of sand or loose particles, gravity pulls the particles downward, causing them to settle at this specific angle. This conical shape maximizes stability and minimizes the risk of collapse, as the weight is evenly distributed around the base.