Ha, we are in the same grade. Let me have a look. You can reply to me later, or you will have to choose to revise your answer.

Oh, I already did. This is very simple. This is a direct formula. Children should pay attention in class.

( 1)

Square of 6-square of 3 = root number 25=5=AD

(2)

6×3 divided by 2=9 (because it is an equilateral triangle, the three sides are equal, and the above problem has been solved, so multiply directly).

By the way, your class is so slow. We are all on the 48th floor. Today's assignment is to write the judgment of the central quadrangle.