find the surface are of cylinder with a radius of 5 m and a height of 8 m. Use 3.14
This site has an excellent explanation of how to find this surface area.
http://www.aaamath.com/geo79x10.htm
find the volume of a pyramid with a length of 1.7 m, a width of 0.9 m, and a height of 2 m.
http://www.mathsteacher.com.au/year10/ch14_measurement/25_pyramid/21pyramid.htm
To find the surface area of a cylinder, we need to calculate the sum of the areas of its two circular bases and its lateral surface area.
1. The area of a circular base is given by the formula: A = π * r^2, where π is approximately 3.14 and r is the radius of the base.
2. The lateral surface area of a cylinder is given by the formula: A = 2 * π * r * h, where h is the height of the cylinder.
Let's calculate the surface area using the given values:
1. The area of one circular base: A1 = π * (5 m)^2 = 3.14 * 25 m^2 = 78.5 m^2
2. The area of the other circular base is also equal to A1.
3. The lateral surface area: A2 = 2 * π * (5 m) * (8 m) = 3.14 * 40 m^2 = 125.6 m^2
4. The total surface area of the cylinder is the sum of A1, A1, and A2: S = 2A1 + A2 = 2 * 78.5 m^2 + 125.6 m^2 = 236.6 m^2
Therefore, the surface area of a cylinder with a radius of 5 m and a height of 8 m is 236.6 square meters.