Question

How do i answer this problem??

Answer 1

So AC and BC are equal length. 
So because of symmetry the CO line segment is the height of the triangle. 
Also AB=6 And as O is the center of the circle AO=AB=6/2=3
OC= 3 (as it is also the radius of the circle)

Area = 6*3/2 (height * base /2)=9