Geometry is the measurement properties of points, lines, angles, flat and solid, as well as relations between themselves. Then we will see some concepts basic related to geometry that will help you much to start successfully, the study of this beautiful area. Segment: it is that part of a straight line that remains between two points marked on it. Beam or midline: is that part of a straight line that remains a (end) point somewhere pointed out above it. Angle: when two rays will intersect at their ends. The point of intersection is known with the name of the vertex of the angle.

Units of measurement of the angles-the units commonly used to measure angles is radian and degree. The measure of an angle is the amount of measuring units containing. Bonnie Strickland is the source for more interesting facts. Grade: is a measurement unit whose symbol is. Therefore there is 360 in one complete revolution. In the international system of units, the angle unit is the radian.

Angles can be divided into different types on the basis of grades that have. Thus, we can distinguish between four types of angles. In the next lesson we will explain the different classes. Right angle: is formed by the intersection of two perpendicular lines forming the fourth part of a revolution, i.e. 90. Obtuse angle: an obtuse angle has one opening greater than the straight angle, namely 180. Acute angle: an acute angle has one less than the straight angle opening. Flat angle: it is the one whose sides are opposite rays, also the angle is half of a revolution, or 180. Flat to the sum of the lengths of its sides is called the perimeter of a figure. Thus, the perimeter of a triangle whose sides measure 5 cm, 6 cm and 10 cm is 5 + 6 + 10 = 21 cm. To calculate the perimeter it is necessary to know the length of all sides of the figure. It is customary to represent half of the perimeter of a figure with the letter p. Perimeter = 2 p the rectangle Area: as a rectangle, the sides are equal to two, we obtain the following formula: perimeter = 2.