Final Answer:
1. Segment
2. Ray
3. Midpoint
4. Right Angle
5. Parallel Lines
6. Obtuse Angle
7. Perpendicular Lines
8. Straight Angle
9. Bisector
10. Area
11. Perimeter
12. Congruent
Step-by-step explanation:
1. Segment: A part of a line with two endpoints and all points in between, denoted as AB, where A and B are the endpoints.
2. Ray: A half-line extending indefinitely from one endpoint. Represented as overrightarrow{AB}, where A is the endpoint.
3. Midpoint: A point equidistant from both endpoints of a line segment.
4. Right Angle: An angle measuring 90 degrees, forming a perfect L-shape.
5. Parallel Lines: Two or more lines with the same slope, never intersecting.
6. Obtuse Angle: An angle measuring more than 90 degrees but less than 180 degrees.
7. Perpendicular Lines: Two lines whose slopes are negative reciprocals, intersecting at right angles.
8. Straight Angle: An angle measuring 180 degrees, forming a straight line.
9. Bisector: A ray dividing an angle into two congruent angles.
10. Area: The number of square units required to cover a surface.
11. Perimeter:The sum of the lengths of the sides of a polygon.
12.Congruent:Having the same measure or size.
These terms are foundational in geometry, providing a precise language to describe geometric figures, relationships, and measurements.