Suppose a triangle has sides a, b, and c let theta be the angle opposite the side of length a. if cos theta < 0 what must be true? a- b^2+c^2> a^2. b- a^2+b^2=c^2. c- b^2+c^2c^2

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)