exam Maths Puzzle Numerical Ability

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Each side of a regular decagon is 20 mm long. Find the length of a segment that joins the midpoint

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exam Other Question
The number of fish Jon catches is dependent on the lures he uses. If fisherman are allowed to use 2 poles at one time that means Jon can use two different lures. If L^1 represents A=2rh+2r^2; solve for h

This is how I worked it out.

A=2rh+2r^2
A-2r^2=2rh+2r^2-2r^2
A-2r^2=2rh

A-2r^2/2r=2rh/2r

A-r=h