If an angle measures less than 90 degrees, it is called an acute angle.

If an angle measures more than 90 degrees and less than 180 degrees, it is called an obtuse angle.

Both acute and obtuse angles are marked with arcs near or at the vertex.

An angle that measures 155 degrees is a(n) _________ angle.

A
right

B
acute

C
obtuse

D
straight