Geometry Vocabulary

3. 2 lines that are never touching. They would have the same slope but different y-intercepts.
6. In a right triangle, the sum of the squares of the legs is equal to the square of the
10. 2 lines that intersect at a right (90 degrees) angle. 1 line would be the opposite reciprocal of the other line.
11. When two or more lines cross each other in a plane. They are different line equations.
12. The ratio of the opposite side to the adjacent sight. It is used for right triangles only.
14. The ratio of the adjacent side to the hypotenuse. It is only used for right triangles.
15. A angle whose vertex is on the circle. And also has sides that are chords of the circle.
16. A quadrilateral having both pairs of opposite sides parallel to each other. The opposite angles are also equal.
18. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end. It is also twice the radius of a circle.
21. Number of cubic units contained in a prism or pyramid. An example is finding the area in a fish tank.

1. Arc whose measure is greater than a semi-circle. It is bigger than 180 degrees.
2. A comparison of two numbers by division. It can compare the proportion between two triangles.
4. A sum of the area of its lateral faces. An example is finding that area of the label of a can.
5. The equation is a^2+b^2=c^2.
7. Sum of the area of all its faces. The amount of space covering the outside of a three-dimensional shape.
8. The statement formed by exchanging the hypothesis and the conclusion of a conditional statement. It is used for proofs for triangles.
9. arc whose endpoints are the endpoints of a diameter. The arc also equals 180 degrees.
13. A logical argument in which each statement you make is supported by a statement that is accepted as true. They are used to prove if triangles are congruent.
17. Arc that is less than a semi circle. It is less than 180 degrees.
19. A straight line extending from the center of a circle or sphere to the circumference or surface. It is also half of the radius.
20. The ratio of the opposite side to the hypotenuse. It is only used for right triangles.