2/3 x (9+12) is 14. Hope it helps :)
A=4×-3 I think this is the equation
The percentage decrease is 60% decrease because it changed by 81 and 81 is 60% of 135
Area of a circle for (360degrees) = pi*(r^2)
Area of part of a circle with angle θ=(θ/360)*(pi*)*(r^2)
<span>(θ/360)*pi*(6^2)=12*pi
</span>solving, <span>θ=(12/36)*360
</span><span>θ=120 degress
</span>