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How many right-angled triangles are there with sides that are all integers less than 100 units?

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Tennis

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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Which is a better fit, a square peg in a round hole or a round peg in a square hole?

Where Is the Dot?

Stage: 3 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

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