Çözüldü Area of Rectangle and Triangle - Trigonometry

What is the area of a rectangle in square units if the angle between its diagonal and one of its sides is π / 12 radians?

A) 18
B) 24
C) 36
D) 42
E) 60
(Adaptation of a question from Çözüm Press, 10th Grade Tests, Test 36, Question 5)

Area(Rectangle) = 2·(1 / 2)·12·{ 12·cos(π / 12) }·sin(π / 12) = 12·6·sin(π / 6) = 12·6·(1 / 2) = 12·3 = 36 square units.