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nahimi
23.04.2020 •
Mathematics
Part A
You will first perform a construction using traditional tools. Watch this video about constructing a tangent line to a circle. Use paper, a pencil, a compass, and a straightedge to perform the construction shown in the video. In your own words, write the steps used for constructing tangent lines to a circle from a point outside the circle with only a compass and straightedge.
Part B
You will now perform the construction of a tangent to a circle using modern tools. Open GeoGebra, and complete each step below. If you need help, follow these instructions for using GeoGebra.
1.Create a circle with a center at point A with a radius of your choice.
2.Now create a point outside of circle A, and label it point B. Draw a line segment connecting points A and B. Find the midpoint of line segment AB, and label it point C.
3.Using point C as the center, create a circle that passes through point A.
4.Circle A and circle C intersect at two points. Find these intersection points, and label them points D and E.
5.Draw rays from point B through point D and from point B through point E. Also draw line segments connecting points A and D and points A and E.
Take a screenshot of your image, save it, and insert the image in the space provided.
Part C
Look at the circle you created that has point C (the midpoint of AB ) as its center and passes through point A. What can you say about AB ∠BCD ∠BEA, and the measures of those two angles? Use what you know about the inscribed angle of a circle, and include your reasoning in your response.
Part D
What do the measures of angles BDA and BEA and the fact that AD and AE are radii of circle A tell us about BD and BE Explain your answer.
Part E
Using the tools in GeoGebra, measure ∠BDA and ∠BEA to confirm the results found in part C. Take a screenshot of your image showing the angle measures, save it, and insert the image in the space provided.
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Ответ:
Please refer to the attached diagram. The given circle is the blue circle centered at A and the given exterior point is C.
Draw line segment ACUsing the same radius for each, which radius is longer than half the length of AC, draw the orange arcs centered at A and C so that they intersect at points D and E.Draw the yellow line DE. Designate the point where it intersects AC as point F. This is the midpoint of AC.Using F as the center, draw green circle F with radius FA (or FC). Designate the points where circle F intersects circle A as points G and H.Your tangent lines are CG and CH (shown in lavender).Ответ: