MATH

Isosceles Has 2 congruent sides and angles

Polygon 3 or more line segments with no open, rounded, or crossed angles

5 sides 5 angles Pentagon

6 sides 6 angles Hexagon

Rhombus Parallelogram with 4 congruent sides

Acute angle Less than 90 degrees

Vertex Common endpoint

Square Parallelogram with 4 congruent sides and angles

Straight angle Straight line 180 degrees

Angle Formed by two rays with a common endpoint

Ray Line with an endpoint

Obtuse angle Angle greater than 90 degrees but less than 180 degrees

Right angle 90 degrees

7 sides 7 angles Heptagon

8 sides 8 angles Octagon

Trapezoid 1 pair of opposite sides are parallel

Parallelogram Opposite sides are parallel and congruent so are the opposite angles

9 sides 9 angles Nonagon

Regular Polygon All congruent side lengths and angle measures

Scalene No congruent sides and angles

10 sides 10 angles Decagon

4 sides 4 angles Quadrilateral

3 sides 3 Angeles Triangle=180 degrees