Answer:
It is given that , In ΔABC , in which, ∠A=25°, ∠B=43°,
Length of side c= 17 units
As, angle sum property of triangle says that
∠A +∠B +∠C=180°
25°+43°+ ∠C=180°
∠C=180° -68°
∠C=112°
Using Sine Rule

So, Side opposite to angle A=a=7.75 units
Side opposite to angle B=b=12.50 units
And , ∠C=112°