In the given figure for <R ,the opposite side is r and the adjacent side is s.
Given r=7,s=10.
Tan of any angle is the ratio of opposite and hypotenuse.
Tan R=[tex] \frac{opposite }{hypotenuse} [/tex]
Substituting values of opposite r=7 and adjacent s=10 we have:
Tan R =[tex] \frac{7}{10} =0.7 [/tex][tex]
R= Tan^{-1} (0.7) [/tex]
R= 34.99 degrees
R= 35 degrees
Option A is the right answer.
