FIND THE AREA OF THE BLUE TRIANGLE.

MATHEMATICS OLYMPIAD HARD QUESTION.
TRIGONOMETRIC IIDENTITIES, PYTHAGORA´S THEOREM AND TRIANGULAR RULES ARE USED TO FIND THE BLUE AREA REGION.
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[@animalfarm7467]

OR find the x-value of the intersection point at F of the two lines y=x and y=(-6/10)x+6 i.e. x,y = (15/4,15/4) Then use A = b*h/2 = (6*15/4)/2 = 11.25 Not so hard! Definitely not an "OLYMPIAD HARD QUESTION"