1. The problem is to find the sine of the number 10. 2. We assume the number 10 is in radians since no unit is specified. 3. The sine function is defined as $\sin(10)$. 4. Using a calculator or software, $\sin(10) \approx -0.544021$. 5. Therefore, the sine of 10 radians is approximately $-0.544021$.