1st Semester Vocabulary

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1st Semester Vocabulary by Mind Map: 1st Semester Vocabulary

1. Corresponding Angles

1.1. The angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal

2. Endpoint

2.1. A point at which a line segment or a ray ends

3. Vertex

3.1. each angular point of a polygon, polyhedron, or other figure.

4. Ray

4.1. a ray is a line with a single endpoint (or point of origin) that extends infinitely in one direction

5. Opposite Rays

5.1. Two rays with a common endpoint that point in opposite directions and form a straight line

6. Segment

6.1. a part of a figure cut off by a line or plane intersecting it

7. Regular Plolygon

7.1. A regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length)

8. Isometry

8.1. An isometry is a transformation in which the original figure and its image are congruent.

9. Dilation

9.1. A dilation is a transformation (notation ) that produces an image that is the same shape as the original, but is a different size. A dilation stretches or shrinks the original figure.

10. Reduction

10.1. When an image's size is reduced, but is similar to the original image

11. Enlargement

11.1. a kind of transformation that changes the size of an object. The image created is similar to the object

12. Center of Dilation

12.1. The center of dilation is a fixed point in the plane about which all points are expanded or contracted

12.1.1. https://www.khanacademy.org/math/geometry-home/transformations/dilations-scaling/v/dilating-from-an-arbitrary-point-example

13. Alternate Interior Angles

13.1. When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but inside the two lines

14. Alternate Exterior Angles

14.1. When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but outside the two lines

15. Equiangular triangle

15.1. An equiangular triangle is a triangle where all three interior angles are equal in measure

16. Obtuse Triangle

16.1. An obtuse triangle is one with one obtuse angle (greater than 90°) and two acute angles

17. Scalene Triangle

17.1. A scalene triangle is a triangle that has three unequal sides