Perimeter of cylinder and cone = circumference of cylinder and cone bottom =2× pi × radius = circumference ÷ pi ÷ 2c = 2 ∏ r = c 悏 2 circumference = π× diameter = circumference ?. = C∏ area of circle = area of cylinder and cone = pi × square of radius s bottom =∏×r×r lateral area original column lateral area = circumference of cylinder bottom× high s side =c×h because c=2∏r c=∏d, The side area of the cylinder can also be written as follows: S. Bottom circumference = side area of the cylinder ÷ cylinder height C=s side ÷ bottom diameter = side area of the cylinder ÷ d=s side ÷ H ÷ bottom radius = side area of the cylinder ÷ cylinder height ÷ 2r = S. (One side area+two bottom areas need to be calculated. (2) The cylindrical swimming pool or pool is plastered or tiled with cement around and at the bottom. (Only one lateral area+one base area is calculated) 2. (1) How many pieces of iron sheets are needed to make ventilation pipes, downpipes and chimneys? (2) The road surface area that the front wheel of the roller has pressed. (Only one lateral area is calculated) Volume of cylinder Volume of cylinder = bottom area× high V column =s bottom× H-bottom area of cylinder = high S- bottom of cylinder = high V-h column = volume H = volume of cone with V bottom = area of cone with V bottom× high V- cone = bottom S × high S bottom of current cone = V× 3 ÷.