Download Geometry Vocab #2 Polygon—A closed, flat surface with straight

Geometry Vocab #2
Polygon—A closed, flat surface with straight lines and at least 3 sides
Regular Polygon—A polygon whose sides all have the same length and whose angles all have the same
measure.
Triangles—A three-sided polygon
Quadrilateral—A four-sided polygon
Pentagon—A five-sided polygon
Hexagon—A six-sided polygon
Octagon—An eight-sided polygon
Decagon—A ten-sided polygon
Obtuse triangle—One angle is obtuse
Right triangle—One angle is a right angle.
Acute Triangle—All angles are acute
Equilateral triangle—All three sides are equal
Isosceles Triangle—2 equal sides
Scalene Triangle—No equal sides
Parallelogram—Quadrilateral with two pairs of parallel sides; opposite angles have the same measure
Trapezoid—Quadrilateral with exactly one pair of parallel sides
Rectangle—A special type of parallelogram that has four right angles
Rhombus—A special type of parallelogram whose sides are equal in length
Square—A regular quadrilateral with equal sides and equal angles (right angles)
Circle—A closed, curved shape
Diameter—The distance across the circle
Radius—Half of the diameter
Circumference—the distance around the circle (perimeter)