4. In right triangle BDF, right-angled at D, if BD = 15 cm and BF = 17 cm, find(a) the length of DF; and(b) the length of DH.
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Answer:
according to pythagoras theorem 17^2=DF^2+15^2
therefore DF^2=17^2-15^2=64
or DF=8
please specify the point H.
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