height of the cone is 30 cm. a small cone is cut off at the top by a plane parallel to the base. If its volume be 1/27 of the volume of the given cone, then the height above the base at which the section has been made is :
a) 10cm
b) 15cm
c) 20cm
d) 25cm
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Step-by-step explanation:
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a 10 cm is right answer please check
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