There are four possible squares with a vertex at distance a from the centre and two vertices on the circle of radius r. Find their areas in terms of a and r.
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The square areas are (r2+a2±√(6r2a2-r4-a4))/2.
Like church stained glass
Eyes open to the world
That filters the light
Tiles that contribute to beauty
Hand in hand
Heart to heart
The squares of hapiness