1.

Circle \[{{C}_{2}}\] passes through the centre of circle \[{{C}_{1}}\]and is tangential to it. If the area of \[{{C}_{1}}\]is \[4\text{ }c{{m}^{2}},\] then the area of \[{{C}_{2}}\] is _____.

A. \[8\,c{{m}^{2}}\]
B. \[8\,\sqrt{\pi \,}c{{m}^{2}}\]
C. \[16\,c{{m}^{2}}\]
D. \[16\sqrt{\pi }\,c{{m}^{2}}\]
Answer» D. \[16\sqrt{\pi }\,c{{m}^{2}}\]


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