# Chapter 7 - Trigonometry and Periodic Functions - Exercises to Skills for Special Angles - Page 324: 21

$$x=5$$

#### Work Step by Step

Using trigonometry, we find: $$\sin \left(30^{\circ \:}\right)=\frac{x}{10} \\ \frac{10x}{10}=10\sin \left(30^{\circ \:}\right) \\ x=5$$

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