a.18π
b.25π
c.10π
d.81π
e.58π
f.None of the listed answers are correct
Which is the area of the figure formed by rotating AB with endpoints A(0,5,9) and B(0,0,9) about the z - axis?
2016-05-27 3:58 pm
回答 (1)
2016-05-27 10:53 pm
✔ 最佳答案
AB ⊥ z-axisSo the area is a circle.
R = AB = 5
Area = π*R^2 = π*5^2 = 25π
Ans: b
收錄日期: 2021-05-02 14:09:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160527075835AAZBQFq