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The modulus of elasticity is simply the ratio between stress and strain. Elastic Moduli can be of three types, Young’s modulus, Shear modulus, and Bulk modulus. In this article, we will understand elastic moduli in detail.

The set of all points in a plane, the sum of whose distances from two fixed points in the plane is constant is an ellipse. These fixed points (two) are the foci of the ellipse. When a line segment is drawn joining the two focus points, then the mid-point of this line is the center of the ellipse.