If the area of two similar triangles are equal prove that they are congruent
QR is a tangent at Q. PR //AQ, where AQ is a chord through A, the end point of the diameterAB and P is a centre. Prove that BR is tangent at B.
ans
What is a Euclid's is division of Lemma
((tan^-1)y -x).dy=(1=y^2).dx
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