Unit 5 Vocabulary

1. Unit 5 Vocabulary By:Marissa

2. Acute Angle An Acute Angle is an angle that is less than 90 degrees. For example: A 60 degree angle.

3. Adjacent Angles Adjacent angles are angle that are next to each other. For example: In a straight angle, if you have one angle you can figure out the other.

4. Axis The axis is how something is labeled. For example: an angle could be labeled JKL.

5. Bisecting an Angle Bisecting an angle means to intersect with another angle. For example: Angle MN bisects with angle AB.

6. Concentric circles Concentric circles are circles that have the same center. For example: The could be 3 concentric circles.

7. Congruent figures Congruent figures are two figures that are exactly alike. For example: All line segments have the same length.

8. Consecutive angles Consecutive angles are two angles in a polygon that share a common side. For example: A square has consecutive angles.

9. Corresponding angles or sides They are the matching sides or angles of congruent polygons. For example: Each pair is the same length .

10. Inscribed Inscribed means something whose vertices are all on the same circle. For example: All the points on the square is on the same circle.

11. Isometric Isometric is changing the position of something but not losing its shape. For example: ”!” In an isometric transformation is “¡”.

12. Transformation A transformation is moving something still keeping its shape. For example: Rotating an object.

13. Line of reflection A line of reflection is a line halfway between a figure having an equal amount on the other side. For example:

14. Mid Point A mid point is a point halfway between two other points. For example: The middle of a line segment.

15. Obtuse Angle An obtuse angle is an angle more than 90 degrees and less than 180 degrees. For example: 120 degrees.

16. Ordered number pair Ordered number pair means two numbers that are used to locate a point on a coordinate grid. For example: The first number gives the position along the horizontal axis.

17. Parallel line A parallel line is a line that is the same length between another line. For example: A line in a square is parallel to it’s opposite side.

18. Perpendicular Perpendicular means meeting at right angles. For example: lines, rays, line segments meet at right angles.

19. Perpendicular bisector This means that lines crossing each other still can meet at right angles. For example: A cross.

20. Preimage Preimage means a geometric figure that is changed to make another figure. For example: A reflection, rotation or translation

21. Reflection A reflection is flipping another shape over the line of reflection. For example: Looking at the opposite way of a figure.

22. Reflex Angle A reflex angle is an angle over 180 degrees and 360 degrees or under. For example: 270 degrees.

23. Right Angle A right angle is an angle that is at 90 degrees exactly. For example: All angles in a square are right angles.

24. Rotation Rotation is a movement of a shape around a point. For example: You can move a triangle around while keeping the top point in the same spot.

25. Sector A sector is a section of a circle. For example: A pizza slice.

26. Straight Angle A straight angle is an angle exactly at 180 degrees. For example: A straight line.

27. Supplementary angles Two angles that when added together equal 180 degrees. For example: Two right angles.

28. Translation Translation means moving a figure in a straight line. For example: Sliding a figure over.

29. Transversal A line that crosses two or more other lines. For example: Two lines going horizontally and one vertically.

30. Vertex A vertex is a point on a angle. For example: where two lines meet each other to make a right angle.

31. Vertical angles Vertical angles result when two lines intersect. For example: A cross sign.