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IfP -= ((1)/(x_(p)), p ), Q = ((1)/(x_(q)),q), R = ((1)/(x_(r)), r) wherex _(k) ne 0 ,denotes thek^(th)terms of a H.P. fork in N , then : |
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Answer» ar. `( Delta PQR)= (p^(2)Q^(2)R^(2))/(2) sqrt((p-q)^(2) + (q-r)^(2) + (r-p)^(2))` |
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