Answer:
D: Obtuse
Step-by-step explanation:
An Acute angle is an angle smaller than a right angle. The range of an acute angle is between 0 and 89 degrees
A Right angle is an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines
A Equilateral angle is also known as an Internal angle of 60°. A equilateral triangle is a triangle in which all three sides are equal
An Obtuse angle is the smaller angle. It is more than 90° and less than 180.