### Home > A2C > Chapter 8 > Lesson 8.1.2 > Problem8-16

8-16.

Find the measure of angle $A$ in the diagram below.

The length $0.3$ is opposite angle $A$ and the length $1$ is the hypotenuse.
Which trigonometric relationship works with opposite and hypotenuse?

$\text{sin}A=\frac{0.3}{1}$

$A = \operatorname{sin}^{−}¹\left(0.3\right) ≈ 17.46°$