Truncated cone 5

The height of a cone 7 cm and the length of side is 10 cm and the lower radius is 3cm. What could the possible answer for the upper radius of truncated cone?

Correct result:

r1 =  10.1414 cm

Solution:

h=7 cm s=10 cm r2=3 cm x=s2−h2=102−72=51 cm≐7.1414 cm r=r2−x<0 r1=r2+x=3+7.1414=10.1414 cm

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