A cylindrical reservoir, from 5 meters, high is 6 meters, to be coated on the surface, the average thickness is 10cm, then the cement surface brushs silver powder, how many square meters is the area of the silver powder? (Results Retaining a decimal) PS: 2020 high quality final mathematics test volume! Want to verify your answer!
addition: ah! Not, the radius is 6 meters, high is 4 meters. Trouble, thank you!
Additional: He said that it was on the surface of the cement brush silver powder, he should have a ring, above .....
+3Votes
Silver powder area = bottom area + side area
π * R2 + π * D * h = 3.14 * (5-0.1) 2 + 3.14 * (5-0.1) * 2 * 6 =260.0
+2Votes
有什么问题吗
亲