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Let angleA=23^(@), angleB=75^(@) and angleC=82^(@) be the angles of DeltaABC. The incircle of DeltaABC touches the sides BC, CA, AB at points D, E, F respectively. Let r', r_(1)^(') respectively be the inradius, exradius opposite to vertex D of DeltaDEF and r be inradiusof DeltaABC, then Q.(r')/(r)= |
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Answer» `"sin"(A)/(2)+"sin"(B)/(2)+"sin"(C )/(2)-1` |
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