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?

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You need to know the following knowledge to solve this word math problem:

solid geometry
cone
frustum
planimetrics
Pythagorean theorem
right triangle
triangle
units
length
8th grade (13y)
9th grade (14y)
high school

We encourage you to watch this tutorial video on this math problem: video1 video2