Hi, You have to find length of AB (See screen) AB - is the hypotenuse of a right triangle ABC. According to the Pythagorean theoremAB = [tex] \sqrt{BC^{2} + CA^{2}} [/tex] BC = AD + EB = 1 + 5 =6 CA=ED = 4 AB = [tex] \sqrt{6^{2} + 4^{2}} [/tex] = [tex] \sqrt{36+ 16} [/tex] ≈ 7.2
