a) x=N1x1+N2x2
b) x=N2x1+N1x2
c) x=N1x1-N2x2
d) x=N2x1-N1x2
Answer: a
Explanation: From nodal displacement equation we can write that isoparametric equation as
x=N1x1+N2x2
Here both displacement u and co-ordinate x are interpolated within the element using shape functions N1 and N2. This is called isoparametric formulation in literature.
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