GeoGebra Basics Practice Answer Key Spheres Student Independent Practice Have students perform the radii measurements and the requested relative distances using Teacher note: Figure 1 as a referene. Require them to provide their answers to four decimals places. Expect the numbers obtained by students to be slightly different from the ones in this answer key (but at least the same integer part and first decimal) and vary from student to student. Figure 1. Marble spheres of assorted Set Up a Work Session Open a new GeoGebra session. Use the full screen window. In insert the picture file, MarbleSpheres.jpg, which is the same image as Figure 1. Graphing View, Place the lower left image corner at the origin, and the lower right corner at (10.64, 0). Set the image as the background. Exercises Estimate the on-screen radius for sphere 13. What is this 13 (r2 0.4391): Sphere on screen radius r 0.6626 ≈ ≈ If the real diameter of sphere 13 is 5.62 cm, estimate the real radius of sphere 1. 1 (r2 0.6201): 0.7875. Sphere on screen radius r Using a simple proportion: ≈ ≈ 1 3.3397 Sphere estimated real radius: r cm ≈
GeoGebra Basics Practice Answer Key Spheres Student Independent Practice Teacher note: Have students perform the radii measurements and the requested relative distances using Figure 1 as a referene. Require them to provide their answers to four decimals places. Expect the numbers obtained by students to be slightly different from the ones in this answer key (but at least the same integer part and first decimal) and vary from student to student. Figure 1. Marble spheres of assorted Set Up a Work Session Open a new GeoGebra session. Use the full screen window. In Graphing View, insert the picture file, MarbleSpheres.jpg, which is the same image as Figure 1. Place the lower left image corner at the origin, and the lower right corner at (10.64, 0). Set the image as the background. Exercises Estimate the on-screen radius for sphere 13. What is this Sphere 13 on screen radius (r2 ≈ 0.4391): r ≈ 0.6626 If the real diameter of sphere 13 is 5.62 cm, estimate the real radius of sphere 1. Sphere 1 on screen radius (r2 ≈ 0.6201): r ≈ 0.7875. Using a simple proportion: Sphere 1 estimated real radius: r ≈ 3.3397 cm
uoh_circuit_lesson01_activity1_geogebra-basics-as_v2_tedl.docx