In a circle a chord, 3 centimetres away from the centre is 8 centimetres long. The length of the diameter of the circle is :
A12 centimetres
B8 centimetres
C5 centimetres
D10 centimetres
A12 centimetres
B8 centimetres
C5 centimetres
D10 centimetres
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If the circumference of a circle increases from , what change occurs in its area?