12.
12x3 is already 36, more than 30..
Answer:
Step-by-step explanation:
Perimeter of quarter circle = r + r + 

2) d = 2*10 = 20 cm
Perimeter of semicircle = diameter + (1/2) * circumference of circle

3) Perimeter of three-quarter = r + r + (3/4)* circumference of circle

468 seats is the answer.
26 x 18
or
13 x 2 x 9 x 2
both equal 468
It's Feedback A. B is wrong because natural numbers would be reversed with whole numbers, and c is wrong because irrational numbers would be outside.