PLEASE HELP
find the area

31.4 is the area..heres how I'm positive because if u multiply the full circle it wouldn't be half so 6.28xthats

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.