A rectangular screen of a graphing calculator has dimensions 6.5 cm by 4.5 cm. What is the length of the diagonal of the screen to the nearest tenth?
This is an application of the Pythagorean Theorem. The length and width of the screen form two legs of a right triangle and the diagonal is the hypotenuse. If we let d = the length of the diagonal (hypotenuse), then by the Pythagorean Theorem:
d2 = (6.5)2 + (4.5)2
Solve for d.