ilovejustinbieber20
ilovejustinbieber20
30-05-2017
Mathematics
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Helppppp mathhhhhhhhhhh
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mreijepatmat
mreijepatmat
30-05-2017
DEF is a isosceles right triangle, so DE =EF. apply Pythagoras:
DF² = DE² + EF² , BUT DE = DF .then DB² = 2DE² = 28²
DE² = 28/2 = 14 and DE = √14 = 3.71 ≈3.7
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