In particular, N1+N2+N3 represent a plane at a height of one at nodes ______
a) One
b) Two
c) Three
d) One, two and three
Answer: d
Explanation: Any linear combination of these shape functions also represents a plane surface. In particular, N1+N2+N3 represents a plane height of one at nodes one, two, and, three and thus it is parallel to the triangle 123.
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