The perimeter is D. 19.1.
We can tell this because we have the lengths of all 3 sides.
We know RQ because it is given at 6.1
We know OQ because it is given at 6.5
And because sides that are opposite the same angle are the same length, we know that OR is also 6.5.
When we add those 3 together, we get 19.1
