1).angle is nothing but the deviation among two points. when two points are lie on a same line those two points are said to be collinear.that means the angle between them is 180 because they lie...
An element is are common features of a subject. (e.g. the elements of music could be texture, tone etc.) These are the elements of chemistry.
because they are made of only one type of atom.
values
Yes, so as long as the angle being identified (in this case, angle b) is in the center.
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