POLYGONS CONVEX POLYGON

All of its angles are smaller than 180º

At least one of its angles is bigger than 180º

CONCAVE POLYGON

• Triangle

• Cuadrilateral

• Pentagon

• Hexagon

3 sides - 3 vertices4 sides - 4 vertices5 sides- 5 vertices6 sides- 6 vertices

POLYGONS

• …

• equilateral

• isosceles

• escalene3 equal sides

3 equal angles2 equal sides

2 equal angles3 different sides

3 different angles

TRIANGLES Clasification by relative lengths of its sides

• acutangle

• right

• obtusangle3 angles smaller than

90ºOne of its angles is 90ºOne of its angles is

bigger than 90º

TRIANGLES Clasification by internal angles

Bisector angles

INCENTER

TRIANGLES ELEMENTS OF A TRIANGLE

It is the centre of the inscribed circumference

Perpendicular bisector to each side

CIRCUMCENTRE

TRIANGLES ELEMENTS OF A TRIANGLE

It is the centre of the circumference that passes through all the vertices

Medians (Straitgh lines that links a vertice to the middle point of the opposite side

INCENTRE

TRIANGLES ELEMENTS OF A TRIANGLE

It is the gravity centre

Altitudes (Perpendular lines from a vertex to the opposite side)

ORTHOCENTRE

TRIANGLES ELEMENTS OF A TRIANGLE

CUADRILATERALS SQUARE

• Parallel and equal length of the sides

• All the angles make 90º degrees

CUADRILATERALS RECTANGLE

• Parallel sides and equal two by two

• 90º degrees angles

CUADRILATERALS ROMBHUS

• Parallel sides two by two and equal lenght

• Equal angles two by two

• Perpendicular diagonals.

CUADRILATERALS RHOMBOID

• Parallel and equal sides two by two

• Equal angles two by two

CUADRILATERALS TRAPEZIUM

• It has two parallel sides called bases

BIGGER BASE

SMALLER BASE

CUADRILATERALS TIPES OF TRAPEZIUM:

Isosceles (non parallel sides of equal lenght)

Right (two angles of 90º degrees)

CUADRILATERALS TRAPEZOID

• 4 different sides

• 4 different angles