I shall be 70 this 5th August, 2017. Myself retired from a PSU in India in 2008. I love arithmetic, algebra, geometry, trigonometry and a bit of physics. Mark my point I love. I am NOT EXPERT. I am using this forum mainly to help needing persons and to keep my brains active in healthy subjects.

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Level 2 in Trigonometry Level 1 in Geometry