Classification of Quadrilaterals
· Quadrilateral: figure having four sides.
· Trapezia (DEF: It is a quadrilateral with opposite sides parallel)
· Parallelogram (DEF: It is a square with sides parallel opposition)
· Rectangular (DEF: It is a parallelogram with all angles equal)
· Rombo (DEF: It 's a parallelogram with all sides equal)
· Picture (DEF: It is a parallelogram which has both properties
of the rectangle and the rhombus that has all the angles and all sides equal).
In a circle is always the following property: Consider the string AB
then insist that all the angles on the same arc therefore have the same width as CAB = CFB = CDB CEB
If the diameter of the rope is then all angles are equal and share a cab that is 90 ° = CFB = CEB = CDB = 90 °
Line Intersection - Circle
A line can be compared to a circle secant, tangent, depending on outside its distance from the center is less than, equal to or greater than the radius. We can also say that a straight line and a circle are:
if secant line and circle have two points of intersection. In this case, the distance from the center is less than the radius: r OP <
tangent line if and girth have one point of intersection. In this case, the distance from the center is equal to the radius: r = OK
outer circumference and a straight if they have no point of intersection. In this case, the distance from the center is greater than the radius: OH> r
Median and Centroid
The median is the segment connecting a vertex to the midpoint of one side .
The center of gravity is the intersection of the three medians.
Height and orthocentre
The height is the segment that joins a vertex and perpendicular to the opposto.L 'orthocentre is the intersection of three heights.
Iron and circumcenter
The axis is the segment passing through the midpoint of one side and perpendicular to the side stesso.Il circumcenter is the intersection of the three axes.
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