Question

In rectangle PQRS, diagonal PR makes a 60 degrees angle with side PS. If PR =10, what is the area of the rectangle?

Answer 1

Hint: Think of the ubiquitous 3-4-5 right triangle, scaled up to 6-8-10.

Answer 2

Nope. Forgot the 60 degree angle. In that case, recall that cos 60 = 1/2