The answer will depend on whether the volume is obtained by rotating the region about the x-axis or the y-axis. These will give very different answers so, without that information, there is little point in attempting an answer.
pi radius squared. (radius squared, then multiply by pi.)
You have to determine the value of pi squared.
It is 8*sqrt(2)/3 = 3.7712 approx.
you can use pythagorean theroum. a squared plus b squared equal c squared (a^2+b^2=c^2) where a and b are the short and long sides and c is the hypotnuse
The area of a circle is pi * radius2. If you already have the radius squared, you just have to multiply that by pi.
For a square, the area is always 1/4 of the perimeter squared. Or one side squared.
Centripetal force. The water wants to fall out due to gravity, but the speed of the rotating bucket cancels it out, creating an inward acceleration.. It is the same as why you don't fall out of an upside sown roller coaster. The speed has to such to cancel out gravity acceleration, where velocity squared divided by the radius of the rotating circle is the acceleration of gravity
To determine the surface area of a period (right rectangular), there is a unique formula. It is lw+l to the square root of w/2 squared + h squared + w square root of (l/2) squared + h squared. L=Length, W=Width, H=Height.
If I understand your question correctly, you would need to subtract the area of the inscribed circle from the circumscribed circle. Which would approximately be 78.60cm squared.
144 squared is 144 x 144 which equals 20,736.
Power (Joules) = the square root of the voltage squared divided by the resistance
Area of a circle equals pi (3.14) times the radius squared.