yangtheary

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14 years, 7 days

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These are questions asked by yangtheary

Prove that in any acute triangle of sides a,b,c semiperimeter p ,inradius r and circumradius R, the following inequalities hold : 2/5 < Rp/(2aR+bc) < 1/2.

Calculate the area of an image limited by ruler
x=y ; x=2y ; x+y=a ; x+3y=a

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