Basics of Triangles - English

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Outline:

Increase the font size using the Options menu Draw a triangle Measure the angles of the triangle Display area and perimeter on the triangle Show that sum of the interior angles is 180 degrees Show that exterior angle is equal to sum of interior opposite angles Draw external lines to the sides of the triangle Draw altitudes to the triangle Locate the orthocenter of the triangle Draw angle bisectors to the angles of the triangle Draw an incircle to the triangle