From the given set of formula, which one is not a linear function?
A rectangle whose width of w units and length of 5 units has an area which can be described as, A = 5W.
A rhombus with a height of 19−−√ units and a side of S units has an area which can be described as, A = S19−−√.
A right triangle with a base of 5 units and a height of H units has an area which can be described as, A = 5/2h.
A circle with radius of r units has an area which is described by the function, A = πr2.
The function that is not a linear function is: A = πr^2.
A linear function is a function that can be represented by a straight line on a graph. The other three functions provided, A = 5W, A = S19−−√, and A = 5/2h, can all be represented as straight lines on a graph and therefore are linear functions.
However, the function A = πr^2 represents the area of a circle, and the graph of this function would be a curved shape (a circle). Therefore, A = πr^2 is not a linear function.