if r+r1+r2+r3=4R cos c
r1+r2+r3-r=4R
r+r1+r2=r3 then show c=90°
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if r+r1+r2+r3=4R cos c
r1+r2+r3-r=4R
r+r1+r2=r3 then show c=90°
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