open the parenthes. and then after that you'll get 27+12x-15. if you simplify that then you'll get 12x+12
Answer:

Step-by-step explanation:
Given:
180°<θ<270° and 
We know for any angle
,

∴
Answer:
452.4 cm^2
Step-by-step explanation:
Use the area formula A = πr². With d = 24 cm, r = 12 cm, and so the desired area is
A = π(144 cm^2) = 452.4 cm^2