First find the radius by dividing 19 by 2*pi which is 3.023943919 cm
Surface area of a sphere (the ball) = 4*pi*radius2
Surface area = 4*pi*3.0239439192 => 114.9098689
Surface area of the ball: 115 square centimeters correct to three significant figures.
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yes heat loss is affected by diameter, circumference and surface area. Heat loss depends on the surface area : volume ratio.......the larger this is the more heat is lost if a cylinder having the same volume but a different surface area...(therefre radius and circumference is different)........the cylinder having the larger surface area will loose heat fastest
4*pi*r2. because surface area is equal to circumference of circle.
Find cone base area using a circle's formula, which is pi times (radius squared). Find cone slanted area with this formula:half of the length of the side, times the circumference of the base.. Add the results to get the total surface area.Measure the cone's circumference with this formula: C = pi * d. C is circumference and d is its diameter. Measure the diameter, which is a line from the base's one side, through its center, to the opposite side.Calculate cone slant height from its top to its base's side. Use your slant height and circumference measurement to calculate cone slanted area. Use step one's formula, where "s" is the slant height, and C is the circumference.4 Add your results for cone base area and cone slanted area to get the total cone surface area.
To find the lateral area of a cylinder, multiply the circumference (πd) by the height (πdh). After you have this, you can find the total surface area by adding twice the area of the base (2πr2).(Lateral area = πdh), (Surface area = πdh + 2πr2).
Radius: 6/(2*pi) = 0.9549296586 Surface area: 4*pi*0.95492965862 = 11.4591559 or as 11.459 square cm to three decimal places