The diagram shows two right-angled triangles, ABC ABC\,ABC and ACDACDACD.
AB=20 cmAB = 20\text{ cm}AB=20 cm, BC=12 cmBC = 12\text{ cm}BC=12 cm and CD=9 cmCD = 9\text{ cm}CD=9 cm.
Calculate the length of ADADAD.
Give your answer to 3 significant figures.
Pythagoras Questions
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