Geometry Vocabulary

1. the theorem that proves congruent parts of triangles are congruent
4. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides
7. two points that lie on the same plane
10. the larger arc joining two points on the circumference of a circle
12. a plane figure with at least three straight sides and angles
13. an angle that has a measure greater than 90 but less than 180
14. 1/2 the measure of the central angle
16. the theorem that is used to find the hypotenuse of a triangle
19. a straight line from the center to the circumference of a circle or sphere.

2. a line segment connecting two points on a curve
3. two angles that add up to be 180 degrees
5. the portion of a cone or pyramid that remains after its upper part has been cut off by a plane parallel to its base
6. the formula name for S = (A+B+C) / 2
7. with endpoints and located on a circle's circumference and vertex located at the circle's center
8. part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints
9. another word for height of a triangle
11. the portion of the circumference of a circle
15. the trigonometry acronym (sine, cosine, tangent)
17. a triangle with no right angles
18. a transformation that has both a reflection and translation