2 Three rods equal length 1 connected in such away 42 that they from an equilateral triangle PQR Q be the mid point of PQ and OR

Question

2 Three rods equal length 1 connected in such away 42 that they from an equilateral triangle PQR Q be the mid point of PQ and OR remains constant for small in increment of temperature Linear expn coefficienents of PR and PQ are same a and linear expn coefficients of PQ is than 1 4 3 3 p4 R 2 3 4 4

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