20 1 1 How to do the eighth problem of Guangzhou One Model Mathematics?

MDN is obviously a right triangle.

Let the midpoint of MN be p.

DP=MN/2= 1

Is to find the surface area of 1/8 ball.

S=4π* 1^2* 1/8=π/2

LS self-synthesis ...

In other words, Baidu has few experts. I think it's because Baidu's problem level is low and it's tiring. To do this, it is best to develop thinking about foreign countries (such as Russia) competition.

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