Ellis is painting wooden fenceposts before putting them in his yard. they are each 7 feet tall and have a diameter of 1 foot. th
1 answer:
Hence, Ellis will need 259.05 unit paint to paint all surfaces of 11 fenceposts.
<h2>What is the surface area of a cylinder?</h2>If, Radius of the cylinder be r and height of the cylinder be h,
Then, Surface area (A) = sq. unit
<h3>How to solve?</h3>Ellis is painting wooden fenceposts which are of cylindrical shape.
The height of a fencepost (h) = 7 feet
The diameter of a fencepost = 1 foot
So, The radius of a fencepost (r) = foot
Given, the value of is 3.14
∴ The surface area of a fencepost (A) =
= (2×3.14××7)+(2×3.14×) sq. feet
= (21.98+1.57) sq. feet
= 23.55 sq. feet
For 1 fencepost, Paint needed = 23.55 unit
For 11 fenceposts, Paint needed = 23.55×11 unit
= 259.05 unit
Hence, 259.05 unit paint is needed for 11 fenceposts.
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