��ABC is an isosceles right triangle, AB=a,
AC=BC= 2 2 a��
So S ��ABC = 1 2 AC? BC= 1 2 �� 2 a 2�� 2 a 2 = a 2 4��
The area of the middle
What is the best eight-character pattern?
First, the Japanese branch is a favorite god, and the pattern of t