Ud1.5 circles

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Unidad Didctica para 1ESO: Dibujo Tcnico

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  • 1. TECHNICALDRAWINGTECHNICAL DRAWING & BASICGEOMETRIC CONSTRUCTIONSJULIA MENA GARCA

2. CIRCLESCIRCLES 3. OPEN PAGE 88 ON YOUR BOOK-LOOK T HESE WAT ER LILY PLANTS, AND T HOSE ORANGES CUT IN HALF.-NAME AS MANY CIRCULAR T HINGS YOU CAN T HINK OF THAT ARE FOUND INREAL LIFE. 4. LETS SEE THE DIFFERENCES BETWEEN...A CIRCLE AND AN ELLIPSEA circle has only one axis, while an ellipse has two. 5. LETS SEE THE DIFFERENCES BETWEEN...A CIRCLE AND AN SPHERECIRCUMFERENCE CIRCLE SPHEREA circle is two dimensional while a sphere is threedimensional 6. USING THE COMPASSA compass is used to make curved shapes orcircles. It is also used to create line segments ofequal lenght.It is an easy to use and precise drawing tool. Intechnical drawing, compasses are used forinscribing perfect circles or arcs.The compass can be named as well as a pair ofcompasses. 7. THE CIRCUMFERENCEA circumference is the length of the closed curved line of thecircle.A circle has a centre point and every point on the closed curvedline is the same distance from the centre point.EXERCISENow do the exercise 9 on page 87. Draw a circumferenceknowing three points and no centre. 8. OPEN PAGE 87 ON YOUR BOOKLETS DO THE EXERCISE 9. Join points A and B and draw the line segment bisector. 10. 90Then do the same thing with points B and C. 11. Note that the point where both perpendicular bisectorscross is the centre of the circumference. 12. RADIUS-Finally, draw a circumference using that point asthe centre and any of the other points. 13. RADIUS-Finally, draw a circumference using that point asthe centre and any of the other points. 14. -Concentric circumferences have the same axis.-A tangent interior circumference touches the interior circumference of anothercircle.-An external circunference doesnt touch the other circumference.-An intersecting circumference intersects another circumference in at least twopoints.EXTERNAL CIRCUMFERENCE INTERNAL CIRCUMFERENCETANGENT EXTERIORCIRCUMFERENCETANGENT INTERIORCIRCUMFERENCEINTERSECTING CIRCUMFERENCECONCENTRIC CIRCUMFERENCES 15. OPEN PAGE 87 ON YOUR BOOKLETS DO THE EXERCISE 16. OPEN PAGE 87 ON YOUR BOOKEXAMPLE 17. OPEN PAGE 81 ON YOUR BOOKWE WILL LOOK AT HOW TO CARRY OUT SOME COMMON GEOMET RICCONST RUCT IONS USING A COMPASS AND A RULER.CREAT E A FREE COMPOSIT ION MADE UP OF CIRCLES USING A COMPASS ANDT HEN COLOUT T HEM WIT H PENCILS OR FELT-T IP PENS.IF YOU HAVE COMPASS ADAPTOR & EXTENSION, YOU CAN USE T HEM TO VARYT HE SIZE AND DRAW T HE SHAPES WIT H T HE COLOURS. 18. EXAMPLE