Whoever answers quickest gets brainliest!

1. line CD

2. ray AC

3. EF

4. obtuse

5.18°

6.65°

7. 73°, acute

8.obtuse, scalene

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.