< b="" />Introduction: < />
An angle is a measure of rotation between two lines or line segments that meet at a common point, called the vertex. Angles are classified based on their measurements, and they can be categorized as acute, obtuse, right, or straight angles.

< b="" />Acute Angles: < />
Acute angles are angles that measure less than 90 degrees. They are smaller than a right angle. For example, an angle measuring 45 degrees is an acute angle.

< b="" />Obtuse Angles: < />
Obtuse angles are angles that measure more than 90 degrees but less than 180 degrees. They are larger than a right angle. For example, an angle measuring 120 degrees is an obtuse angle.

< b="" />Right Angles: < />
Right angles are angles that measure exactly 90 degrees. They form a perfect L-shape. For example, the corners of a square or a rectangle are right angles.

< b="" />Straight Angles: < />
A straight angle is an angle that measures exactly 180 degrees. It forms a straight line. For example, a line segment extended from one end to the other forms a straight angle.

< b="" />Understanding the Question: < />
The question states that the angle is 101 degrees. We need to determine which category this angle falls into.

< b="" />Analyzing the Options: < />
a) Straight angle: A straight angle measures 180 degrees, which is more than 101 degrees. Therefore, option 'A' is incorrect.
b) Right angle: A right angle measures 90 degrees, which is less than 101 degrees. Therefore, option 'B' is incorrect.
c) Acute angle: An acute angle measures less than 90 degrees, which is less than 101 degrees. Therefore, option 'C' is incorrect.
d) Obtuse angle: An obtuse angle measures more than 90 degrees but less than 180 degrees. Since 101 degrees falls within this range, option 'D' is the correct answer.

< b="" />Conclusion: < />
Based on the given measurement of 101 degrees, we can conclude that it is an obtuse angle.