Experiment 1: To verify that the angle bisector of the vertex angle of an isosceles triangle is perpendicular to the base and bisects it.
| Figure |
∠ADB |
∠ADC |
BD |
DC |
Results |
| I. |
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| II. |
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Conclusion: The bisector of vertical angle of an isosceles triangle is perpendicular to the base and bisects it.
Experiment 2: To verify that the perpendicular bisector of the base of an isosceles triangle bisects the vertical angle.
| Figure |
∠BAD |
∠CAD |
Results |
| I. |
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| II. |
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Conclusion: The perpendicular bisector of the base of an isosceles triangle bisects the vertical angle, i.e., ∠BAD = ∠CAD and ∠ADB = ∠ADC = 90°.