Angles formed when two straight lines or rays intersect at a point

When two straight lines or rays intersect at a point, they form different types of angles. These angles are categorized based on their measurements and relationships with other angles. The correct answer to this question is option 'D', which refers to straight angles. Let's understand why.

Straight angles
- A straight angle is formed when two lines or rays intersect in such a way that they form a straight line or a 180-degree angle.
- In other words, a straight angle is the largest angle that can be formed by any two intersecting lines or rays.
- It is a straight line, and its measurement is equal to 180 degrees.
- A straight angle can be thought of as a "straight line cut in half" by the point of intersection.

Other types of angles formed when two lines or rays intersect at a point
- Acute angles: These are angles that are less than 90 degrees. They are smaller angles formed when the lines or rays intersect at a point, and they are on the same side of the perpendicular bisector.
- Obtuse angles: These are angles that are greater than 90 degrees but less than 180 degrees. They are larger angles formed when the lines or rays intersect at a point, and they are on the same side of the perpendicular bisector.
- Right angles: These are angles that measure exactly 90 degrees. They are formed when the lines or rays intersect at a point, and they are perpendicular to each other.

Summary
In summary, when two straight lines or rays intersect at a point, they can form different types of angles. The correct answer to the question is option 'D', which refers to straight angles. Straight angles are formed when the lines or rays form a straight line or a 180-degree angle.