The diagram shows a piece of wood which is obtained by cutting off the lower section of a cone.
Using PI = 3.142, calculate the value of x.
I seriously have no idea on how to find $x$.
Any helps are appreciated.
2026-03-28 06:13:23.1774678403
Find the height of frustum of a cone
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Hint:
$\frac{7}{10} = \frac{10}{10+x}$
$10+x = \frac{100}{7}$
If you name the bottom apex as "O", center at radius 7 "A", Edge at radius 7 "B" and center at radius 10 "C", Edge at radius 10 "D" Then OAB is similar to OCD by angles (AAA).