Across
- 3. The amount of turn between two straight lines that have a common end point (the vertex).
- 5. A plane shape (two-dimensional) with straight sides.
- 8. An instrument used in measuring or drawing angles
- 10. The middle of. The point halfway along.
- 11. The size of a surface. The amount of space inside the boundary of a flat (2-dimensional) object
- 13. A 5-sided polygon
- 15. A 8-sided polygon
- 17. A 7-sided polygon
- 18. A _________ is one which is more than 180° but less than 360°
- 19. An _______ is one which is more than 90° but less than 180°
- 20. A triangle that has all angles less than 90°
- 23. A line segment connecting two points on a curve.
- 25. Lines that are at right angles (90°) to each other.
- 30. A triangle that has an angle greater than 90°
- 33. A 4-sided flat shape with straight sides where all interior angles are right angles (90°).
- 34. An angle less than 90°
- 36. A line with a start point but no end point (it goes to infinity)
- 37. Two lines on a plane that never meet. They are always the same distance apart.
- 40. Two Angles are _______ when they add up to 180 degrees.
- 41. A 4-sided flat shape with straight sides where all sides have equal length, and every interior angle is a right angle (90°)
- 42. A 3-sided polygon
- 43. A 4-sided flat shape with straight sides where all sides have equal length.
Down
- 1. A straight line going through the center of a circle connecting two points on the circumference.
- 2. A triangle that has a right angle (90°)
- 4. A 6-sided polygon
- 6. A long thin mark made by a pen, pencil, etc. Is straight (no curves)
- 7. A straight angle changes the direction to point the opposite way. It looks like a straight line. It measures 180°
- 8. A _______ is a flat surface with no thickness. It extends forever.
- 9. Two Angles are _______when they add up to 90 degrees (a Right Angle).
- 12. An angle which is equal to 90°, one quarter of a full revolution.
- 14. A 2-dimensional shape made by drawing a curve that is always the same distance from a center.
- 16. A triangle with all sides of different lengths.
- 21. An instrument with two arms, one sharp and one with a pencil that can be used to draw circles or arcs.
- 22. The distance from the center to the edge of a circle. It is half of the circle's diameter.
- 23. The same shape and size. Two shapes are congruent when you can Turn, Flip and/or Slide one so it fits exactly on the other.
- 24. A flat shape with four straight sides.
- 26. A 4-sided flat shape with straight sides where opposite sides are parallel.
- 27. A 10-sided polygon
- 28. Two nonparallel lines in space that do not intersect are called skew lines.
- 29. The distance around the edge of a circle (or any curvy shape).
- 31. An exact location. It has no size, only position.
- 32. A straight line inside a shape that goes from one corner to another (but not an edge).
- 35. A 4-sided flat shape with straight sides that has a pair of opposite sides parallel.
- 38. A 9-sided polygon
- 39. A point where two or more straight lines meet. A corner.