Evaluate
\frac{13\pi }{18}\approx 2.268928028
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\frac{\pi }{18}+\frac{6\times 2\pi }{18}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 18 and 3 is 18. Multiply \frac{2\pi }{3} times \frac{6}{6}.
\frac{\pi +6\times 2\pi }{18}
Since \frac{\pi }{18} and \frac{6\times 2\pi }{18} have the same denominator, add them by adding their numerators.
\frac{\pi +12\pi }{18}
Do the multiplications in \pi +6\times 2\pi .
\frac{13\pi }{18}
Combine like terms in \pi +12\pi .
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