Across
- 2. a shape with eight sides
- 10. a triangle that has at least two sides that are congruent
- 11. a polygon is a _____________ polygon if all of the sides are congruent and all of the angles are congruent
- 12. measurement uses familiar figures to find a missing measure when it is difficult to find directly
- 13. lines in the same plane that do not intersect are ________________ parallel
- 15. two angles are ________________ angles if the sum of their measures is 90 degrees.
- 18. a triangle that has one right angle is called a(n) _____________ triangle
- 19. a triangle is ___________________ if it has three congruent angles
- 20. angles opposite angles formed by the intersection of two lines.
- 21. a line that intersects two or more lines is called a ______________________
Down
- 1. a polygon is _________________ if at least one line segment connecting any two vertices lies outside it
- 3. a triangle whose angles ALL measure less than 90 degrees is called a(n) _____________ triangle
- 4. a triangle that has one obtuse angle is called a(n) _________________ triangle
- 5. angles that have the same measure
- 6. a triangle that has three congruent sides
- 7. triangles that have the same shape but not necessarily the same size are called ______________ triangles
- 8. a polygon is ________________ if every line segment connecting any two vertices lies entirely inside it
- 9. lines that intersect at right angles are called _________________________ lines
- 14. two angles are _________________ angles if the sum of their measures is 180 degrees.
- 16. a closed plane figure made up of three or more line segments that intersect only at the endpoints
- 17. a shape with 3 sides