You are 200 yards from a river. Rather than walking directly to the river, you walk 400 yards along a straight path to the river’s edge. Find the acute angle between path and the river’s edge.
We can use the sine inverse here.....we have
sin-1(200/400)
sin-1(1/2) = 30°
Here's a pic.....
I think you need:
Sin(x)=200/400
Sin(x)=1/2
Asin(1/2)=30 degrees, so
x=30 degrees.
