As shown in the figure, in the triangle ABC, ab = AC, angle BAC = 90 degrees, D is the midpoint of BC, De is perpendicular to DF, if be = 12, CF = 5, calculate EF

As shown in the figure, in the triangle ABC, ab = AC, angle BAC = 90 degrees, D is the midpoint of BC, De is perpendicular to DF, if be = 12, CF = 5, calculate EF

Answer: I use my mobile phone to access the Internet, and some mathematical symbols can't be written. According to Pythagorean theorem: the square of de + the square of DF = the square of EF, substituting into the data, we get EF = 13. Ask: known is be = 12, CF = 5, how do you get De, DF? Answer: sorry, wrong number. Because AB = AC, be = 12, CF = 5, so AE = 5, AF = 12, in right triangle AEF, we get EE = 13 according to Pythagorean theorem