Question

Which equation is correct for ∆FON?

Answers:
A.) cos F= 9/18
B.) sin F 9/18
C.) sin F=18/9
D.) cos F=18/9

Answer 1

the picture in the attached figure

we know that

in the right triangle FON

sin F=opposite side angle F/hypotenuse

in this problem

opposite side angle F=ON--------> 9 units

Hypotenuse=FN--------> 18 units

so

sin F=ON /FN-------> sin F=9 /18

therefore

the answer is the option

B.) sin F 9/18