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vertices of the polygonal line

Points A_{1}, A_{2}, ... A_{n}

sides of the polygonal line

segments ‾A_{i}A_{i+1}‾

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endpoints of the polygonal line

points A_{1} and A_{n }

convex of a polygonal line

if it lies on each side of each of its segments

a closed polygonal line

a polygon whose endpoints coincide

polygon

a figure formed by a closed non-self intersecting polygonal line, if no three consecutive vertices are on the same line.

polygonal line is closed if

its initial and its terminal points coincide

polygonal region

the closed polygonal line will be the boundary

perimeter of the polygon

the sum of the lengths of the sides of a given polygon

area of a polygonal region

to every polygonal region there corresponds a unique positive number (called area...)

central angle of a circle

an angle with its vertex at the center of the circle

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Semicircle

If AB is a diameter of this circle and H is one of the half-planes determined by AB, the set of all points on this circle that belong to H together with the points A and B

minor arc

the set of all points on the circle C(O,r) in the interior of a central angle ∠AOB together with the points A and B

major arc

the set of all points on C(O,r) which do not belong to the minor arc, together with the points A and B

proportion of (pairs of) segments

segments are proportional if their lengths patronizes like *a**:**b**=**c**:**d*.

Cosine of an angle

in a right triangle, the ratio of the side adjacent to the angle and the hypotenuse

Right Angle

An angle that equals 90 degrees

rectangle

a parallelogram in which all angles are right angles

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