Posted by **Vincent** on Saturday, April 6, 2013 at 10:23pm.

A plane leaves point A and flies S80° E to point B400 km away. How far east of A is B (to the nearest kilometer)?

- Math -
**rbowh**, Saturday, April 6, 2013 at 10:37pm
Draw this on a graph. Put point A on the positive y-axis. From A, draw a line that looks to represent 80 degrees, to the x-axis at point B.

The distance from the origin to B is what you want to find.

In that right triangle with right angle at the origin, sin 80 degrees = x/400. Solve for x.

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