exam Maths Puzzle Numerical Ability

Find the length, to the nearest tenth, of the apothem of a regular octogon whose sides are each 10 inches long????

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Please help me on this,
Recall: the height in feet after t secs is h(t)=-16t^2+vt+s
A Ball is dropped(so the initial velocity is zero) and it takes 5 seconds to hit the ground. I A rectangular garden has perimeter 66ft and area 216ft squared. Find the dimensions of the garden.