Please state the original problem.
Much information has been omitted.
1. What is the gradient and the equation of the line AB?
2. What is the gradient of CD and equation of CD?
3. What is the point of intersection of AB and CD?
4. What is the length of the lines AB and CD?
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Is all this true?
. . You don't know the Slope Formula?
. . You can't write the equation of a line?
. . You don't know the Distance Formula?
If so, you need more help than we can offer.
I recommend you consult your teacher.
You diagram doesn't give us much information.
. . Is the midpoint of ?
. . Is perpendicular to ?
Are we expected to guess all that?