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Pythagorean Triples


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A tennis ball is served from directly above the baseline (assume the ball travels in a straight line). What is the minimum height that the ball can be hit at to ensure it lands in the service area?

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Square Pegs


Where Is the Dot?


The radius of the circle is $1$ unit long.
You can use the radius as the hypotenuse of the right-angled triangles.