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Omni-MATH / The top section of an 8 cm by 6 cm rectangular sheet of paper is folded along a…

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problem

The top section of an 8 cm by 6 cm rectangular sheet of paper is folded along a straight line so that when the top section lies flat on the bottom section, corner PP lies on top of corner RR. What is the length of the crease?
Plain-text mathematical notation (without MathML)
The top section of an 8 cm by 6 cm rectangular sheet of paper is folded along a straight line so that when the top section lies flat on the bottom section, corner P lies on top of corner R. What is the length of the crease?
Original LaTeX notation
The top section of an 8 cm by 6 cm rectangular sheet of paper is folded along a straight line so that when the top section lies flat on the bottom section, corner $P$ lies on top of corner $R$. What is the length of the crease?

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