![]() A kite, where two wooden sticks crosses and hold the kite.Railroad crossing signs (X) placed on the roads for safety of vehicles.At an airshow, we experience two vapor trails that crosses each other and make vertical angles. ![]() The maximum vertical angle set for a roller coaster ( Mumbo Jumbo, Flamingo Land’s) is 112 degrees. These angles are so important that if they displaced a degree above or below, there would be a chance of an accident.
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