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The radius of a hemisphere is r. What is its volume?

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2pie r^2
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2/3×π×r×r×r
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Just to make it easy for you, I am making this statements. Simply remember the area of the circle = pi*r^2. Multiply this by another radius quantity so it becomes = pi*r^3. Now just multiply with 4/3 to get the volume of the sphere= 4/2*pi*r^3. To get hemisphere volume just divide by two (Hemisphere...
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Just to make it easy for you, I am making this statements.

Simply remember the area of the circle = pi*r^2.

Multiply this by another radius quantity so it becomes = pi*r^3.

Now just multiply with 4/3 to get the volume of the sphere= 4/2*pi*r^3.

To get hemisphere volume just divide by two (Hemisphere = half the sphere) so Hemisphere volume=2/3*pi*r^3 ( if you like to know the exact derivation of this quantity you can go through integral calculus).

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2×π×r×r×r
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Solve : 55x + 52y = 217; 52x + 55y = 217
subtract two equations from each other, we get x=y and then substitute x=y in any of the equation we get values for x and y . x=1.972 ,y= 1.972
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The mean of 10, 15, x, 5, 15 is 15. What is the value of x?
Mean=sum of all observations÷total no. of observations 15 = (10+15+X+5+15) ÷ 5 75 = 45 + X X = 75 - 45 X = 30 So x is 3
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