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Anna007 [38]
3 years ago
6

Helppppp mathhhhhhhhhhh

Mathematics
1 answer:
tester [92]3 years ago
4 0
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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7 0
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