The answer depends on what R and S are! And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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You need two sets to have an intersection. If you have two sets, call them R and S, then their intersection is the set T that contains all elements of R that also belong to S OR all elements of S and also belong to R...it's the same thing.
The intersection of two sets S and T is the set of all elements that belong to both S and T.
s+s+s+s*3/2 * * * * * No, that is not true. A rhombus is like a skewed square: it has four sides which are of equal length r. The perimeter is, therefore, r+r+r+r = 4*r
R = S + 2T S = 3T .... substitute R = (3T) + 2T R = 5T
Intersection of Medians-Centroid Intersection of Altitudes-Orthocentre