Take your original birthday (example: July 7th), and add exatly six (6) months to it (the half birthday of our example would be calculated like this: 1.) August 2.) September 3.) October 4.) November 5.) December 6.) January so the half birthday of July 7th would be January 7th)
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A quarter birthday is half a half birthday.A half birthday is in between your birthday and birthday...
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.
half it, than half it again, then add the first half and the second half you made together.
3/8
You simply calculate it like a cone, but the height of the cone is the height to the top of the FILLED part, not all the way. Half-filled is not enough information . . . there can be "half filled" meaning half the height of the cone, but can also be "half filled" meaning half the volume of the cone.