1. Geometry and Measurement 4th Grade MCA Math Review

2. vertical angle Vertical Angles are the angles opposite each other when two lines cross They are called "Vertical" because they share the same Vertex (or corner point) J. Scheumann and C. Sorenson

3. 90 angle An 90 degree angle. This is also called a right angle. J. Scheumann and C. Sorenson

4. angle arc Click here to see a 10 second demonstration We can measure Angles in Degrees. There are 360 degrees in one Full Rotation (one complete circle around). J. Scheumann and C. Sorenson

5. congruent Two figures that are the same size and the same shape. J. Scheumann and C. Sorenson

6. rotation Click here to watch it! A rotation is a turn of an object. J. Scheumann and C. Sorenson

7. clockwise Clockwise is the direction in which the clock rotates or turns, to the right. J. Scheumann and C. Sorenson

8. counterclockwise counter = against Counterclockwise is the opposite direction in which a clock rotates, to the left. J. Scheumann and C. Sorenson

9. transformation Moving a shape so that it is in a different position, but still has the same size, area, angles and line lengths.Turn, flip or slide are the basic moves. J. Scheumann and C. Sorenson

10. translation Try it! http://www.mathsisfun.com/definitions/translation.html Moving a shape, without rotating o flipping it. "Sliding".The shape still looks exactly the same, just in a different place. J. Scheumann and C. Sorenson

11. reflection Try it! http://www.mathsisfun.com/geometry/reflection.html A reflection is a flip over a line J. Scheumann and C. Sorenson

12. image An image is like a reflection in a mirror. Everything is the same, except reversed.The left and right sides are mirror images of each other. A picture J. Scheumann and C. Sorenson

13. symmetry Symmetry is when one shape becomes exactly like another if you flip, slide or turn it. J. Scheumann and C. Sorenson

14. quadrilateral A 4-sided polygon J. Scheumann and C. Sorenson

15. parallelogram Squares, Rectangles and Rhombuses are all Parallelograms Opposite sides are parallel and equal in length, and opposite angles are equal (angles "a" are the same, and angles "b" are the same) J. Scheumann and C. Sorenson

16. rhombus A four-sided shape where all sides have equal length. Also opposite sides are parallel and opposite angles are equal.It is a type of parallelogram. J. Scheumann and C. Sorenson

17. kite A quadrilateral with two pairs of sides of equal length. J. Scheumann and C. Sorenson

18. square A 4-sided polygon (a flat shape with straight sides) where all sides have equal length and every angle is a right angle (90°) J. Scheumann and C. Sorenson

19. rectangle A rectangle is a four-sided polygon (a flat shape with straight sides) where every angle is a right angle (90°).Also opposite sides are parallel and of equal length. J. Scheumann and C. Sorenson

20. trapezoid A trapezoid is a quadrilateral with one pair of opposite sides parallel. J. Scheumann and C. Sorenson