NanamiD746495 NanamiD746495

27-10-2022
Mathematics

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Given the right △△DEF, DE = 30, EF = 72 and DF = 78. Find the cos F=

Given the right DEF DE 30 EF 72 and DF 78 Find the cos F class=

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JaheirJ618500 JaheirJ618500

27-10-2022

see the figure below to better understand the problem

cos(F)=EF/DF --------> by CAH

substitute given values

cos(F)=72/78

simplify

cos(F)=12/13

Option C

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