The diameter is 24 since if you ÷ it by 2 you get 12 to get area it is radius squared so 12 × 12= 144×pi which is 3.14= 452.16 mm you can even check in a calculator
The answer will be A. Hope it help!
The temperature went down by 12 degrees. (Or you could say it changed by -12 degrees)
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