See, if you draw a cyclic quadrilateral and its diagonals from the centre O, the angles at the centre are double the angles at the circle. So, two opposite corners are like two customers sitting across from each other in my salon — one’s facing the mirror, the other’s facing the window, but together they see the whole room. Their angles must add to 180 degrees, just complete.
Every month, when I calculate my daughter’s fee against my four salon chairs, I remember this — four points, two pairs, each pair’s worry and joy always balancing to make a full circle of responsibility.
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