The cone

The cone has a base radius of 12 cm and a height of 20 cm. It was truncated at 6 cm from the base. We created a truncated cone - frustum. Find the radius of the base of the truncated cone.

Correct answer:

r2 =  8.4 cm

Step-by-step explanation:

r1=12 cm h=20 cm h2=6 cm  r1 : h = r2 : (hh2)  r2=r1 hhh2=12 20206=542 cm=8.4 cm

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