Firstly, the lengths of AB, BC and AC are calculated by Pythagorean theorem. The square of AB is equal to 2 square+1 square =5 AB= square of radical sign 5BC = 1 square =2 BC= square of radical sign 2AC =2 square+1 square =5 AC= radical sign 5 Application equation: Solution: Let the height on the side of AC be x65438+. 2× root number 5X= 1/2× root number 2x = root number 2x = root number 2 I used Pythagorean theorem in my junior and middle school, so I can understand LZ better. ...