Across
- 4. a triangle where all three sides are different in length
- 6. any triangle that has two sides the same length
- 10. a drawing instrument used for drawing circles and arcs
- 14. A line which cuts a line segment into two equal parts at 90°
- 15. any angle smaller than 90 degrees
- 18. A portion of a line which starts at a point and goes off in a particular direction to infinity
- 19. the point where all three angle bisectors always intersect, and is the center of the triangle's incircle
- 21. The common endpoint of two or more rays or line segments
- 22. two angles that are adjacent and supplementary
- 24. to divide into two equal parts
- 25. a tool used to measure angles
- 26. a line or ray that divides an angle into two congruent angles
- 27. exactly equal in size and shape
- 28. an angle whose measure is exactly 90°
- 29. is the change in y for a unit change in x along the line
Down
- 1. the space between two intersecting lines or surfaces at or close to the point where they meet
- 2. a fixed reference line for the measurement of coordinates
- 3. when a line meets at a right angles or 90°
- 5. when two angles add up to 90 degrees
- 7. two angles that add up to 180
- 8. a point of concurrency of the triangle
- 9. when lines lie in the same plane and are the same distance apart over their entire length
- 11. angles that share a common vertex and need not be drawn one above the other
- 12. the point at which the perpendicular bisectors of the sides of a triangle intersect and which is equidistant from the three vertices
- 13. A line that cuts across two or more (usually parallel) lines
- 15. two angles that share a common side and common vertex without overlapping
- 16. all three altitudes always intersect at the same point
- 17. an angle with a measure greater than 90°
- 20. To draw a shape, line or angle accurately using a compass and ruler
- 23. two angles that are formed on opposite sides of a line that intersects two other lines