Geometry Vocabulary

1. angles, Two angles that are opposite each other and are congruent when two lines intersect.
6. angles, A pair of angles formed when two lines are intersected by a transversal, with one angle inside and the other outside the lines.
7. angles, two angles whose measures add up to 180 degrees.
9. a point that divides a line segment into two equal parts.
11. A measure of the space inside a 3D shape.
12. theorem, A relationship between the sides of a right triangle, defined by a^2 +b^2=c^2
13. An angle that is less than 90°.
16. area, The total area of the outer surface of a 3D object.
18. angle, An angle that measures exactly 90°.
19. Lines that are in the same plane and don't intersect.
20. A shape that has four right angles and opposite sides that are equal in length.
23. The sum of all the sides of an object.
25. A shape with three sides and three angles.

2. angles, two angles whose measures add up to 90 degrees.
3. pair, A type of angle formed when two lines intersect, and the angles are adjacent to each other, adding to 180°.
4. A flat surface that extends infinitely in all directions.
5. A line that intersects another at a 90° angle.
8. triangle, A triangle where all three angle measures are 60 degrees.
10. triangle, A type of triangle with one angle greater than 90°.
14. triangle, A triangle where all three sides are congruent.
15. Two lines that never intersect and are always equidistant.
17. bisector, a ray that splits an angle into two equal smaller angles.
21. A triangle with all angles less than 90°.
22. triangle, A triangle with one angle greater than 90°.
24. A part of a line that has one endpoint and extends infinitely in one direction.