Answer:
R ≈ 17.7
S ≈ 19.0
Explanation:
The angles of the triangle are 90, 43, and 47. Given these we can apply the law of sines.
26/sin(90) = s/sin(43), giving you 17.73195, rounding to 17.7.
26/sin90 = r/sin(47), giving you 19.01519, rounding to 19.0.