In the neighborhood park there is a circular grassy picnic area, but half of the grass has died. the city wants to replant the grass, but needs to know the square footage of the damaged area. if the circular picnic area is 150 feet across, what is the square footage of the damaged area? let pi = 3.14
a) 471 sq. ft
b) 8831.25 sq. ft
c) 17662.5 sq. ft
d) 35325 sq ft

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

2 2/3 hours duhh silly

step-by-step explanation: