If angle A measure 90° and angle B is 45° , that leaves 45° for angle C. (90 + 45 + 45 = 180)
If both non right angles are 45° we have an isosceles right triangle and AC is also 19 feet.
So now we can use the Pythagorean theorem to find the missing side.
a² + b² = c² and we are looking for BC - the hypotenuse of the triangle
19² +19² = c² 361+361 = c² 722= c² and c=√722 or about 26.87
