The circle is closed curve figure where all the points on the curve has the same distance from
the center point.
Radius: straight line segment joining from center to any part of the curve;
Chords: any straight line segments joining two points of de curve;
Diameter is a chord that passes through the center of the circle;
Arc: a curve line segment;
Apothem: the height of the triangle formed, with the connections of the ends of the chord and the center curve;
Circumference: the length curve.
Sagitta: a straight line connecting the midpoints of the curve to the center of its base. It is also the height of an arc. Consequently the radius is also the height of a semicircle.
The division of the circumference by the diameter is always equal to the constant Π (Pi), that is 3.14 ...
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Right Triangle Isosceles Triangle Equilateral Triangle Scalene Triangle Square Rectangle Trapezium Right-Angled Trapezoid Isosceles Trapezoid Rhombus Regular polygon Polygon names Circle Pyramid Triangle pyramid Square pyramid Rectangular pyramid Cube Prism Rectangle Prism Cone Cylinder Sphere Ellipse Parabola Hyperbola