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GeoGebraClasse GeoGebra

C5. The "Semicircle through 2 points" tool

Draw a triangle inscribed in a semicircle Draw a triangle inscribed in a semicircleAll the triangles inscribed in a semicircle are rectangles if the hypotenuse coincides with the diameter. 1st. Activate the "Semicircle through 2 points" tool Toolbar Image. 2nd. Click on two different points in the Graphics View and you will obtain a semicircle between points "A" and "B". 3rd. Activate the "Move" tool Toolbar Imageand name the semicircle "s". 4th. Activate the "Point" tool Toolbar Image and click on semicircle "s". 5th. Activate the "Polygon" tool Toolbar Image and click on the three points "A", "B", "C" and then again on "A" to build an inscribed triangle. 6th. Activate the "Move" tool Toolbar Image and name "TR" the triangle. 7th. Activate the "Angle" toolToolbar Image and click the points "A", "C" and "B". If the angle is different from 90 degrees rectify by erasing the angle first. 8th. Activate the "Move" toolToolbar Image and animate point "C". The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity. If the activity is correct, you will get 10 points automatically.