- Geometry Proof: How to prove that if a rectangle has perpendicular diagonals, it must be a square?

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What is the lost percent when 10 kg of rice is sold for the cost of 8 kg of rice?
Along with process.? Can someone explain how the temperature can range from 75 degrees in Pittsburgh to 45 in Philadelphia during the month of May? How does blood affect the rates of biochemical reactions in the body? Also what are some examples (excluding respiration)? What is an artificial harmonic on guitar? If water has a [H+] =1x10^-7 M,how is it possible to, by adding a base to the water to decrease This concentration.(In terms of equilibrium)?