0.75
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at a 45 degree angle, or pi/4
You find the area using Pi x radius squared then multiply that by 3/4.
cos(30) = sqrt(3)/2 so cosine squared is 3/4.
25.7831 (to 4 dp)
~14.1372 V=(4/3)pi r^3 V=(4/3)pi (1.5)^3=(4/3)pi 3.375=4.5pi~14.1372