For example: triangle inner angle and theorem, experimental tools use paper cutting, splicing and measuring methods to let students feel intuitively, but due to the errors in actual operation, it is difficult to achieve the ideal effect. Now, use the Geometer's Sketchpad to draw a triangle, measure its three interior angles and sum them, then drag the vertices of the triangle to arbitrarily change the shape and size of the triangle, and then find that no matter how it changes, the sum of the three interior angles is always 180 degrees.<br>
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