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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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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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The Old Goats

A rectangular field has two posts with a ring on top of each post. There are two quarrelsome goats and plenty of ropes which you can tie to their collars. How can you secure them so they can't fight each other but can reach every corner of the field?

Garden Shed

Age 11 to 14 Challenge Level:
                    
Suppose we have a garden shed with a roof made from five wooden beams laid out like this:




Each of the four sloping beams is the same length.

The roof of the shed is 300cm long, 240cm wide and 60cm high.                    

What is the total length of wood needed to make these five main beams for the roof?

Can you reduce the amount of wood needed by changing the lengths marked in red?



With thanks to Don Steward, whose ideas formed the basis of this problem.