What was yesterday's math problem 18? I hope I'm right. - Training Enrollment Network

What was yesterday's math problem 18? I hope I'm right.

If -f is the midpoint of the CD, then:

Let b be the origin of rectangular coordinates, and BA and BC coincide with Y and X axes respectively.

The equations of BC and AF are: x = y；; 2y = 8v 2-x；

The coordinates of m and n are: M(v2, v2), N((8V2/3), (8V2/3)).

Then: use the formula to calculate the distance between two points to calculate the length of MN! !

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