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The formula for circumference \( C \) is:
Plug in the given values:
Solving for \( r \):
The formula for the sum of the first \( n \) natural numbers is:
S = \frac{n(n + 1)}{2}
Set the sum equal to 210:
Solve the quadratic equation:
Factor the equation:
n = 20 \quad \text{(since \( n \) must be positive)}
Find the value of \( x \) in the equation \( 3x^2 - 12x + 9 = 0 \).