Geometry Vocabulary

2. Next to each other
7. In the same plane
8. Equal to the ratio of the side adjacent to an acute angle to the hypotenuse
9. The enclosing boundary of a curved geometric figure, especially a circle.
13. A line segment that goes from one corner of a shape to another directly across from it
14. All angles less than 90 degrees
15. Portion of the circumference of a circle
16. Having all angles equal
18. Not having any interior angles greater than 180
20. Either of the two angles of a triangle with a base for a side

1. Not expressible as a ratio of two integers, having infinite and non-recurring expansion when expressed as a decimal
3. A line that splits an angle into two equal angles
4. Of or denoting circles, arcs, or other shapes which share the same centre
5. Line segment joining two points on a curve
6. Angle with endpoints on the circumference of a circle
10. A Greek mathematician
11. The angle between a side of a polygon and an extended adjacent side
12. Finding the probability of more than one event occurring at the same time
17. An angle made from point sitting on a circle’s circumference
19. Shapes exactly the same size and shape