Circle since diameter
area=pir^2
d/2=r
15/2=7.5=r
area=pi7.5^2
area=pi56.25
1/4 of that
56.25pi times 1/4=14.0625pi
answer is 14.0625pi in^2 or aprox 44.1786375 in^2
Hey! Your rational number would be 
2 ^ 10 = 2¹⁰ = 1,024 .
2 ^ 10 este (2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 ) (10 veces) tambien.
That would be a 120 Square Feet.
Use the length of one side of the ceiling, which is 12, and then use the other side that is 10. The ten feet comes from the floor. think of it in 2-Dimensional
3^2 + height^2 = 9^2
9 + height^2 = 81
height ^2 = 72
height = sqrt(72)
