A: What is the perimeter of a circle with radius 160 km in centimeters? (Round your answer to the nearest hundred thousand centimeters.) B: What is the perimeter of the figure in centimeters? (The figure is a square with a semicircle of radius 2 cm on top. Round your answer to one decimal place.)

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

my dear correct answer is option number 3

answer: i ! the answer is   9000 seconds, also d

hope i

-lavira : )