<span>x : y is equal to 12 : 8. These can be reduced or cancelled down to 3 : 2 in the same proportions. Therefore, when y is 12, you have to multiply the smallest value y can be by 6, and must do the same to the smallest x value to retain the proportions. x = 18 when y = 12.</span>
Answer:

Step-by-step explanation:
Split the diametre in half before proceeding:

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Answer:
13
Step-by-step explanation:
12*12=144
5*5=25

-12/-9=y/-4
cross multiply
-9y=48
divide by 9 on each side
y= -5.33