To solve the equation 2*pi*r^2 + 2*pi*r*h you use the quadratic formula. r= [ -piáh ±?(pi_áh_+2áAápi)]/ (2ápi). You then get r>0 --> r= [ -piáh +?(pi_áh_+2áAápi)]/ (2ápi) .
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The total surface area of a cylinder can be found using the formulaA = 2(pi)r2 + 2(pi)rh or A = 2(pi)(r2 + rh)2 (pi x radius squared) = both ends of the cylinderpi x (2 radius) x height = area along the cylinder's side (circumference x height)
There are two ends, each of area {pi}r2 and the side which can be worked out by cutting the cylinder down (from end to end) and unrolling; one length is the cylinder height (h), the other is the circumference of the end (2{pi}r), giving 2{pi}rh. Area = 2x({pi}r2) + 2{pi}rh Area ~= 2x3.14x112 + 2x3.14x11x11 Area ~= 1520.5in2
The formula for surface area of a cylinder is: 2(pi)r2+2(pi)rh. r= radius h= height.
Total Surface Area = 2Ï€r2 + 2Ï€rh = 2Ï€r(r + h) = 2Ï€*2(2 + 8) = 40Ï€ cm2 = 125.664 cm2 approx.
The area of a cylinder = 2πr2 + 2πrh, where π is pi (3.14159...), r is the radius of the top and bottom, and h is the height. Click on the related link below for a tutorial on how to find the area of a cylinder.