A wall bracket consisting of bars AB, AC and AD as shown in the fig 3 are joined must be assumed correctly. The force in the member AB is tension and in the members AC and d AD are compression,
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Explanation:
∣AB∣
=a,
∣AD∣
=b=
∣BC∣
,
∣AC∣
=c
AB
.
AC
=
∣AB∣
∣
AC
∣cos(
AB
,
AC
)
⇒a×c×
2ac
a
2
+b
2
−c
2
⇒
2
a
2
+b
2
−c
2
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