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Experiment 1: The sum of three interior angles of a triangle is 180°
| figure | ∠BAC | ∠ABC | ∠BCA | Sum | Result |
| (a) | | | | | |
| (b) | | | | | |
| (c) | | | | | |
Conclusion: The sum of three interior angles of a triangle is 180°.
▸Experiment 2: Verification of the angles of an equilateral triangle.
| figure | ∠BAC | ∠ABC | ∠BCA | Result |
| (a) | | | | |
| (b) | | | | |
| (c) | | | | |
Conclusion: All the angles of an equilateral triangle are equal (60°).
▸Experiment 3: Verification of the base angles of an isosceles triangle.
| Figure | ∠ABC | ∠ACB | Result |
| (a) | | | |
| (b) | | | |
| (c) | | | |
Conclusion: The base angles of an isosceles triangle are equal.
▸Experiment 4: Experiential Verification of the base angles of a right angled isosceles triangle.
| Figure | ∠CAB | ∠CBA | Result |
| (a) | | | |
| (b) | | | |
| (c) | | | |
Conclusion: Base angles of a right angled isosceles triangle are each 45°.