230 Distance from truss member to truss joint

Problem 230
For the truss shown in Fig. P-230, compute the perpendicular distance from E and from G to the line BD. Hint: Imagine a force F directed along BD and compute its moment in terms of its components about E and about G. Then equate these results to the definition of moment M = Fd to compute the required perpendicular distances.
 

Symmetrical Truss

 

Solution 230

 

Comments

where does the sides of triangle 1,3,√10 ,came from

1,3,√10 comes from

4,12,4√10

it was reduced..

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