If the angle is over 90 degrees the angle is obtuse, smaller than 90 degrees the angle is acute and over 180 degress the angle is a reflex angle
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They are named for the number of sides and angles their shape posses. For example, an octagon has both eight sides and angles.
An irregular shape can be any number of different angles. Irregular simply means its not regular, in other words, it's sides and angles are not all the same size.
A pentagon. It could look like a child's outline of a house.
there is no such thing as left angles.
Yes, it would look like the standard kite shape.