Oh, dude, you're hitting me with some math vibes! So, to find when times pi equals 40, you just divide 40 by pi. That's like 12.73-ish, you know? So, 12.73 times pi is around 40. But, like, who's counting, right?
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40 times 9 equals 360.
0.4 times 100 equals 40
No; circumference divided by diameter equals pi.
It is: 2.875 times 40 = 115
Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.