Geometry vocabulary

2. a part of a straight line that is bounded by two distinct end points,
4. each of the pairs of opposite angles made by two intersecting lines.
8. an angle of exactly 90 degrees
9. An angle which is measuring less than 90 degrees
13. a closed two-dimensional figure in which the set of all the points in the plane is equidistant from a given point called “centre”
15. a triangle in which all three sides are in different lengths, and all three angles are of different measures.
17. a line with a single endpoint (or point of origin) that extends infinitely in one direction.
18. an angle of greater than 90° and less than 180°
19. coplanar infinite straight lines that do not intersect at any point.

1. triangle that has two sides of equal length.
3. an abstract idealization of an exact position, without size, in physical space, or its generalization to other kinds of mathematical spaces
5. a regular quadrilateral, which means that it has four sides of equal length and four equal angles.
6. the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
7. the measure of a region's size on a surface.
10. a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular,
11. the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space.
12. is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle.
14. a quadrilateral whose four sides all have the same length.
16. a closed shape with 3 angles, 3 sides, and 3 vertices.
20. a part of a straight line that is bounded by two distinct end points, and contains every point on the line that is between its endpoints.