Geometry 5th

^p120

^{Measure of angles. Plane angles and full (complete) angles.}

^{See how is measured the angle A with the protractor}

^{*First: place the protractor so that the Center coincides with the vertex of the angle}

^{*Second:  look on the protractor the number through which passes the other side of the angle. This number is his measure in degrees. The angle A measures 45 degrees.} 

^{*Concentrate on the name that these angles have and what measure they have.} 

 

^{Flat angle. It measures 180 degrees and the sides are in the same straight line.}

^{Full (Complete) angle. It measures 360 degrees and the sides coincide.}

GEOMETRY 5th 8-10-13

GEOMETRY 5^th

^{Teacher: Honorio}

^INTRODUCTION

VOCABULARY
Recta= straight line AUDIO	Segment= segment AUDIO
Semirecta= semi straight line AUDIO	Angle recte= right angle AUDIO
Acutangle= acute angle AUDIO	Obtusangle= obtuse angle AUDIO
Adjacent= adjacent AUDIO	Consecutiu= consecutive AUDIO
Vèrtex= vertex AUDIO	Mediatriu= perpendicular bisector AUDIO
Bisectriu= angle bisector AUDIO	Poligon= Polygon AUDIO
Triangle= triangle AUDIO	Rectangle= rectangle AUDIO
Rombe= rhombus AUDIO	Regla= ruler AUDIO
Transportador= protractor AUDIO	Compàs= pair of compasses AUDIO
Graus= degrees AUDIO

^p118

^Angles

^{The sloping tower of Pisa is the belfry of the cathedral of this city.}

^{It was constructed in the year 1173 and since its construction began already he began inclining.}

^{The height of the tower is 55,7 meters and it has a 14700 tons weight.}

^{The inclination of the tower is approximately of 4 degrees from the vertical, and every year increases.}

^{To prevent from falling down, the government of Italy realized, not long ago, a reconstruction work to try to reduce the angle of inclination of the tower.}

^{When was the Tower of Pisa built?}

^{In which of these drawings are the Tower of Pisa data represented?}

^P119

^{Remember what you know}

^{Semi straight line and segment}

^{The point P divides the straight line r in two semi straight lines}

^{The origin of the two semi straight lines is the point P}

^{A segment is the part of the straight line between two points. Points A and B are the ends of the segment AB}

^{Types of angles and its elements}

^{Straight angle sharp angle obtuse angle.}