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OpenStudy (anonymous):
find measurement of E to the nearest degree DE=8 DF= 6 EF= 10. Ef is the hypotenuse
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OpenStudy (dumbcow):
use law of cosines 6^2 = 8^2 + 10^2 - 2*8*10*cosE solve for E
OpenStudy (dumbcow):
If this is a right triangle, you could use simple sin/cos ratios sinE = 6/10 cosE = 8/10
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