What is the area of a circle if the diameter is 18 miles ?

~254.47

Step-by-step explanation:

a=πr² (area=pi(r)^2)

Plug numbers in

r=d/2

r=9

a=π(9)^2

a=81π

a=~254.47

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

160

step-by-step explanation:

idk

i hope i