All questions of Lines and Angles for Class 6 Exam

A point in geometry is an exact location with no length, width, or height. It is usually labeled with a capital letter and is imagined to be very small, representing a specific position without any physical dimensions.

An obtuse angle is one that is greater than 90° but less than 180°. Since 135° falls within this range, it is classified as an obtuse angle.

As you open a book wider, the angle between the cover and the pages increases. The more you open the book, the larger the angle becomes.

An angle is formed when two rays share a common starting point, called the vertex. The rays are known as the arms of the angle.

A right angle measures exactly 90°, which is half of a straight angle (180°). It is often represented by the 'L' shape.

A full turn is a complete rotation around a point, which measures 360°. This is why a circle is divided into 360 equal degrees.

The types of angles based on their measure include acute, obtuse, right, straight, and reflex angles. There is no such thing as a "parallel angle."

Because its a permanent answer 

To measure an angle accurately, place the protractor's center on the vertex of the angle, align one arm with the 0° mark, and read the measure where the other arm crosses the protractor's scale.

The Difference Between a Line and a Line Segment
Understanding the distinction between a line and a line segment is fundamental in geometry. Here’s a detailed explanation:
Definition of a Line
- A line is a straight one-dimensional figure that extends infinitely in both directions.
- It has no endpoints and is usually represented with arrows at both ends, indicating its endless nature.
Definition of a Line Segment
- A line segment is a part of a line that has two distinct endpoints.
- It is defined by the points at either end and contains all the points between these endpoints.
Main Differences
- Endpoints:
- A line has no endpoints, while a line segment has two endpoints.
- Length:
- A line extends infinitely and does not have a measurable length.
- A line segment has a fixed length, which can be measured.
- Representation:
- A line is represented as a straight path with arrows at both ends (e.g., ↔).
- A line segment is represented as a straight path with points at both ends (e.g., AB).
Conclusion
Thus, the correct answer, option 'B', clearly states that a line extends infinitely in both directions, while a line segment has two endpoints. This understanding is crucial for solving problems and applying concepts in geometry effectively.

A protractor is the tool used to measure angles. It is typically a half-circle divided into 180 equal parts, each representing one degree.

Understanding Reflex Angles
A reflex angle is a specific type of angle in geometry. Let’s break down what it is and why option 'C' is the correct answer.
Definition of a Reflex Angle
- A reflex angle is defined as an angle that is greater than 180 degrees but less than 360 degrees.
- This means that it represents a portion of a full circle, which has a total of 360 degrees.
Comparison with Other Angles
- Acute Angle: An angle that is less than 90 degrees.
- Right Angle: An angle that is exactly 90 degrees.
- Straight Angle: An angle that is exactly 180 degrees.
- Full Angle: An angle that is exactly 360 degrees.
Why Option 'C' is Correct
- The correct answer, option 'C', states that a reflex angle is greater than 180 degrees but less than 360 degrees.
- This definition clearly distinguishes reflex angles from acute, right, and straight angles.
Visual Representation
- Imagine a clock:
- The angle formed by the hands at 10:10 is a reflex angle because it measures more than 180 degrees.
Conclusion
Understanding reflex angles is fundamental in geometry as they help us comprehend more complex shapes and figures. Recognizing the characteristics of different types of angles, including reflex angles, is essential for solving various mathematical problems.

A straight angle measures exactly 180° and looks like a straight line. It is formed when the arms of the angle point in opposite directions.

Folding a piece of paper to bisect an angle divides the angle into two equal parts. This line of division is known as the angle bisector.

An acute angle is one that is less than 90°. Since 60° is less than 90°, it is classified as an acute angle.

A ray starts at a specific point and extends infinitely in one direction. It is denoted by the starting point and another point on the ray, such as Ray AB.

An angle bisector is a line or ray that divides an angle into two equal parts, creating two angles of the same measure.