The rigid beam is supported by a pin at A and wires BD and CE. If the load P on the beam causes the end C to be displaced 10 mm downward, determine the normal strain developed in wires CE and BD.

1. Explanation | Hint for next step

Similar triangle rule: Two triangles are said to be similar if the corresponding angles are congruent and the corresponding sides are in proportion.

2.Explanation | Hint for next step

Using similarity of triangles, the expression to calculate change in length of the wire BD is derived. The change in length of the wire CE is given in the question as 10 mm. this value is substituted in the expression to get the value of the change in length of the wire BD as 4.3 mm.

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