To find the circumference \( C \) of a circle with a radius \( r \), you can use the formula:
\[ C = 2 \pi r \]
Given that the radius \( r \) is 90 and using \( \pi \approx 3.14 \):
\[ C = 2 \times 3.14 \times 90 \]
Now, calculate it step-by-step:
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Calculate \( 2 \times 3.14 \): \[ 2 \times 3.14 = 6.28 \]
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Now, multiply by the radius: \[ 6.28 \times 90 = 565.2 \]
So, the approximate circumference of the circle is 565.2.