Most worked in automotive repair and maintenance shops or at automobile dealers. The number of jobs for auto mechanics is expected to rise 17 percent from 2010 to 2020, according to the BLS.
A trapezium (as it is known in English) is a quadrilateral which is a closed plane figure with four straight sides. It has one pair of parallel sides. The other pair of sides â¦is not parallel (otherwise the figure would become a parallelogram). Ally Weber.
As soon as any of the angles becomes less than 180 then you are dealing with a concave shape. This is a good mathematical test that is easy to code against. Convex and Concave in 3D. Hopefully, by this point, you are starting to get a decent idea of what makes a 2D shape concave vs convex.