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1 In the following slides some geometry basics will be presented: Finding the center of a circle/arc Construct a circle from three points Finding the min/max distance between a point and circle/arc page 1 The following notation will be used in the explanations: given objects are marked in GREEN construction steps are marked in ORANGE results are marked in RED (sometimes other colors might also be used for clarity) pastel colors are used for preceding construction steps

2 How to find the center of a circle: page 2

3 How to find the center of a circle/arc: Start by picking three arbitrary points on the circle or arc! To get accurate results it is recommendable to distribute the points uniformly over the circumference of the circle. For an arc use the end points and an arbitrary third point in between. page 3

4 How to find the center of a circle: Start by picking three arbitrary points on the circle! Draw with a compass three circles with same radius (the radius must be sufficient large so that all the circles intersect) around the three points! page 4

5 How to find the center of a circle: Start by picking two arbitrary points on the circle! Draw with a compass three circles! Draw a line through the intersection points of two previously constructed circles! page 5

6 How to find the center of a circle: Repeat the last step with the remaining intersections! The intersection of the two lines is the center of the circle. You can increase accuracy by drawing a line through the remaining two intersections. page 6

7 How to find the center of a circle: Draw a line through the remaining intersections to increase accuracy! page 7

8 Construct a circle from three points: Constructions steps: First construct the center as in the previous construction. Afterwards draw the circle page 8

9 Construct a circle from three points: Draw with a compass three circles with same radius (the radius must be sufficient large that all the circles intersect) around the three points! page 9

10 Construct a circle from three points: Draw with a compass three circles! Draw a line through the intersection points of two previously constructed circles! page 10

11 Construct a circle from three points: Repeat the last step with the remaining intersections! The intersection of the two lines is the center of the searched circle. You can increase accuracy by drawing a line through the remaining two intersections. page 11

12 Construct a circle from three points: Draw a line through the remaining intersections to increase accuracy! page 12

13 Construct a circle from three points: The intersection of the three lines is the center of the searched circle Draw the searched circle by using the compass! page 13

14 Finding the min/max distance between a point and a circle (Ex1): Example 1: Point is outside the circle page 14

15 Finding the min/max distance between a point and a circle (Ex1): Use the compass to draw a circle which intersects with the given circle and has its center at the given point! page 15

16 Finding the min/max distance between a point and a circle (Ex1): Use the compass to draw a circle which intersects with the given circle! Connect the two intersection points with a line! page 16

17 Finding the min/max distance between a point and a circle (Ex1): Use the compass to draw a circle which intersects with the given circle! Connect the two intersection points with a line! Construct a line which is orthogonal to the previously drawn line and passes through A! page 17

18 Finding the min/max distance between a point and a circle (Ex1): The intersections between the line and the circle are at the maximum and minimum distance. page 18 Hint: If the center of the circle is already know, the line constructed in the previous steps can be found easily by drawing a line which goes through the center of the circle and A.

19 Finding the min/max distance between a point and a circle (Ex2): Example 2: Point is inside the circle page 19

20 Finding the min/max distance between a point and a circle (Ex2): Use the compass to draw a circle which intersects with the given circle and has its center at the given point! page 20

21 Finding the min/max distance between a point and a circle (Ex2): Use the compass to draw a circle which intersects with the given circle! Connect the two intersection points with a line! Construct a line which is orthogonal to the previously drawn line and passes through B! page 21

22 Finding the min/max distance between a point and a circle (Ex2): The intersections between the line and the circle are at the maximum and minimum distance. page 22 Hint: If the center of the circle is already know, the line constructed in the previous steps can be found easily by drawing a line which goes through the center of the circle and A.

23 Finding the min/max distance between points and an arc (Ex3): page 23

24 Finding the min/max distance between points and an arc (Ex3): Draw lines through the center of the arc and the given points! (When the center point is not known, it must be constructed like slide 3-8) Intersections with this line are ether maximum or minimum distances. (the arc could intersect the line twice, once or not) page 24

25 Finding the min/max distance between points and an arc (Ex3): Intersections with this line are ether maximum or minimum distances. (the arc could intersect the line twice, once or not) The missing points are found at the endpoints of the arc. (Both points have to be checked) page 25

26 That s it, you survived the tutorial! Questions? Ass.Prof. Dr. Holger Arthaber holger.arthaber@tuwien.ac.at Room: CFEG25 page 26

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