Help! Thanks!

sinθ = opposite/hypotenuse

hence because sinR = 2/5,

opposite = 2 units

hypotenuse = 5 units

using the pythagorean theorem, the adjacent side to angle R would be:

$=\sqrt{5^2 - 2^2}$

$= \sqrt{21}$

therefore sinT = $\frac{\sqrt{21}}{5}$

(sin R)² + (sin T)² = 1

sin(T) = 0.916515139    or   809995 / 883777