Experimental Verifications of Angles

Experiment 1: Vertically opposite angles are equal

Figure 1

Figure 2

Figure	∠ROP	∠QOS	∠ROQ	∠POS	Result
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2

Verified: When two lines intersect, vertically opposite angles are equal.

Experiment 2: Adjacent angles on a straight line sum to 180°

Click on the left or right side of vertex Q to measure angles.

Linear Pair: Figure 1

Linear Pair: Figure 2

Figure∠AQP∠BQPSumResult 1 2

Verified: Sum of adjacent angles on a straight line is 180°.

Experiment 3: Complete angle around a point = 360°

Figure 1

Figure 2

Figure	∠AOB	∠BOC	∠AOC	AOB+BOC+AOC	Result
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2

Conclusion: Complete angle at a point is 360°.