Page 7 - CH - 2 - LN - 2.4

 An obtuse angle is larger than a right angle but smaller than a straight angle, so it
measures more than 90° but less than 180°.

 Example: An angle of 130° is an obtuse angle.
3. Reflex Angle:

 A reflex angle is greater than a straight angle but less than a full circle. This means it
measures more than 180° but less than 360°.
These types cover all possible angles based on their degree measures.

Key Points

 A point is a location with no size, represented by a dot, and labelled with a capital letter such
as A, B, or C.

 A line segment is the shortest distance between two points, having two endpoints, and is
denoted as AB or BA.

 A line extends infinitely in both directions, has no endpoints, and can be represented by two
points or a single lowercase letter.

 A ray starts at one point and extends infinitely in one direction, denoted by the starting point
and another point on the ray, like Ray AB.
 An angle is formed by two rays sharing a common starting point called the vertex, and is
measured by the rotation from one ray to the other.

 Angles are measured in degrees (°), with a full circle being 360°, a straight angle being 180°,
and a right angle being 90°.

 A protractor is a tool used to measure angles, with labelled protractors having marked
degrees for easy reading, while unlabelled protractors require careful counting of degree
units.