If d1, d2 (d2 > d1) be the diameters of two concentric circle s and c be the length of a chord of a circle which is tangent to the other circle , prove that d22 = c2 + d12.

If d1, d2 (d2 > d1) be the diameters of two concentric circle s and c

1.	If d1, d2 (d2 > d1) be the diameters of two concentric circle s and c be the length of a chord of a circle which is tangent to the other circle , prove that d22 = c2 + d12.
Answer» If $d_{1}, d_{2} (d_{2} > d_{1})$ be the diameters of two concentric circle s and c be the length of a chord of a circle which is tangent to the other circle , prove that ${d_{2}}^{2} = c^{2} + {d_{1}}^{2}$ .