It is a right angle you guys are stupid if you do not know that.
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acute is the right answer, because an acute angle is less than 90 degrees so that way a shape that is less than 90 degees is acute
Trigonal Bipyramidal. 90 and 120 degrees
Obtuse triangle: a triangle with one angle greater than 90 degrees.
A square and a rectangle have each of their angles as 90°. However, no polygon or shape (unless it is not closed) can have a total angle sum of 90°
square