posted by Priscila .
Christopher wants to determine how far away a helicopter is from where he is standing. He knows the helicopter is sitting on the edge of a roof of an apartment building that is 400 feet high and 1,050 feet from where he is standing.
the distance is the hypotenuse of a triangle with legs 400 and 1050:
√(400^2 + 1050^2) = 1123 ft