How it was measured:

> Both countries sent teams to climb the mountain using GPS and also trigonometry to make the final calculations.

> “Once the surveyor’s beacon had been placed on the summit, surveyors at stations around the summit measured the distance from the six points to the beacon, which meant at least six triangles could be calculated to determine the mountain’s height,” Jiang Tao, associate researcher at the Chinese academy of surveying and mapping, told the state-run China Daily.