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A right circular cone resting on its bas...

A right circular cone resting on its base is cut at `(4)/(5)`th its height along a plane parallel to the circular base . The height of original cone is 75 cm and base diameter is 42 cm. What is the base radius of cut out top portion cone ?

A

4.2 cm

B

2.8 cm

C

3.5 cm

D

8.4 cm

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The correct Answer is:
A
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