2. A triangle that has two sides of equal length and congruent base angles

3. A triangle that has all angles less than 90 degrees

4. A triangle that has one obtuse angle - An obtuse angle has a measure greater than 90 degrees

5. A triangle that has a right angle - A right angle is equal to 90 degrees

6. A quadrilateral whose opposite sides are parallel and of equal length

7. A triangle with no congruent sides and no congruent angles

8. A circle is the set of all points in a plane that are a distance r from a given point, called the center . -The distance r is the radius of the circle

9. A quadrilateral with four congruent sides and four right angles

10. A quadrilateral with only two parallel sides

11. A triangle with three congruent sides and three congruent angles