Find the missing side length in the triangle below.

https://static.k12.com/eli/bb/1212/2_69068/2_30299_20_69088/ec7995acc7f6b6699d61fa6a90eda2581b71da40/media/2d9944e001b5a5d1c25d3a71e5e7b9baeab865c1/mediaasset_1016570_1.jpg