The angle of the backs of chairs are at an obtuse angle to the seat. There are some straight back chairs that are 90 degrees but most are over 90 degrees.
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Obtuse means that an object is not clear at all and is a solid color. Items such as wood, metal, and bricks are obtuse.
It is not! An umbrella is a 3-dimensional object while an obtuse angle is 2-dimensional.
Table
They are: acute, right angled, obtuse, reflex, straight, and i think thats about it
The hands on a clock!