jiskd
03.04.2020 •
Mathematics
In triangle GHI, GH=6, GI = 7, and mH=64. What dose I equal?
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Ответ:
cos 49° = x over 55
Step-by-step explanation:
The complete question is
Which equation could be used to find the value of x?
Triangle DEF where angle E is a right angle. DE measures x. DF measures 55. Angle D measures 49 degrees.
cos 49° = x over 55
cos 49° = 55 over x
sin 49° = x over 55
sin 49° = 55 over x
see the attached figure to better understand the problem
we know that
In the right triangle DEF
The cosine of angle of 49 degrees is equal to divide the adjacent side to the angle of 49 degrees (ED) by the hypotenuse (FD)
so
substitute the given values
therefore
cos 49° = x over 55