VOCABULARY ARTS (2)

IMPORTANT DEFINITIONS ABOUT ANGLES AND LINES :

*Parallels lines : they are lines wich never interset themselves, so all the points are equidistance.

*Perpendicular: they are lines wich meet forming 4 right angles:

*Oblique: they are lines wich are not parallels noither perpendicular.

*Angles:  it is a figured formed by two rays (sides of angles) sharing a common endpoint (vertex)

TYPES OF ANGLES:

*Complementary angles : they are angles couples of angles wich sum is 90º.

*Suplementary angles: they are couple of angles wich sum is 180º

*Addyacent angles: they are angles that share one side and the vertex

*Right angle:

*Obtuse angle:

*Acute:

*Flat:

*Complet:

*Zero:

THE ANGLE BISECTOR

*It´s an angle that is divide into parts equals.

GRADE OF ANGLES

15º.

30º.

45º.

60º.

120º.

150º.

THE POLIGONS:

NUMBER OF SIDES

• Triangle (3)
• Cuadrilaterals (4)
• Pentagon (5)
• Hexagon (6)
• Heptagon (7)
• Octogon (8)
• Decagon (10)
• Dodecagon (12)

TYPES

• Concave
• Convex
• Star polygon
• Regular
• Irregular
• Inside 
• Given the side
• Other Items

ELEMENTS

• Sides
• Diagonal
• Vertex
• Altitude

*Star polygon: It´s a particular polygon case with a star shape, created out of linking together non        consecutive vertex.

*Inscribed:They´re  polygons place inside circle soo all vertex of the polygon are placed on a circle.

*Circunscribed: They´re polygons sorrounding a circle, being its sides tangent to the circle inside.

*Equiangular: all their corner angles or vertex are equal.

*Equilateral: all edges or sides are of the same lenght.

*Regular: All their vertex, angles and sides are equal.

*Irregular: show different angles and lenght for their sides.

IMPORTANT DEFINITIONS ABOUT TRIANGLES

*Triangle: It´s a flat figure with three sides and three angles.

ACORDING TO THE SIDES:

• EQUILATERAL: 3 sides equal

• ISOSCELES:  2 sides equal 1 unequal

• SCALEN: 3 sides unequal

• RIGHT: 1 angle of  90 degrees.

• ACUTE: 3 angles minor of 90 degrees.

• OBTUSE: 1 angle greater than 90 degrees.

CONSTRUCTION AN EQUILATERAL TRIANGLE:

c = 3 cm

DO THE EQUILATERAL TRIANGLE WHEN YOU KNOW THE RADIOUS:

R= 2 cm.

CONSTRUCTION AN ISOSCELES TRIANGLE WHEN I KNOW 2 SIDES.

a=3 in

c/b= 5 in