Perpendicular Hands
How many times a day do the hour and minute hands lie on the same line, forming an angle of `180^@`? Are any of these lines perpendicular to each other?
Difficulty level (1 very easy - 10 very hard): 3
Topics:
Logic
Proof and Example
->
Proof by Contradiction
Geometry
->
Plane Geometry
->
Angle Calculation
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