Plane Figures CHARTS & TABLES
Plane Figures CHARTS & TABLES
Plane Figures
Circle—closed plane figure that is, at all points, equidistant from the center
Polygon—closed plane figure with three or more line segments
Regular polygon—all interior angles are equal, and all line segments are equal
Equilateral polygon—all sides are equal
Equiangular polygon—all angles are equal
Triangle—three-sided polygon
Equilateral—all sides are equal
Isosceles—two sides are equal
Isosceles right—two sides are equal and one angle is 90°
Scalene—no sides are equal
Right triangle—one angle is 90°
Acute triangle—all angles are less than 90°
Oblique-angled triangle—no right angles
Quadrilateral (tetragon)—four-sided polygon
Trapezoid—quadrilateral with only two parallel sides
Isosceles trapezoid—the nonparallel sides are equal in length
Trapezium—quadrilateral with no parallel sides
Parallelogram—quadrilateral, opposite sides are parallel and equal in length
Square—right-angled parallelogram with all four sides equal in length
Rectangle—right-angled parallelogram
Rhombus—oblique-angled parallelogram with four equal sides
Diamond—quadrilateral with two obtuse angles and two acute angles
Pentagon—five-sided polygon
Hexagon—six-sided polygon
Heptagon—seven-sided polygon
Octagon—eight-sided polygon
Nonagon—nine-sided polygon
Decagon—10-sided polygon
Dodecagon—12-sided polygon