Asked by mine

In acute triangle DEF it is known that m/D=72, DE =7, and EF = 12. To the nearest degree mLF=
Answered by oobleck
by the law of sines,
sinF/7 = sin72°/12
sinF = 0.5547
F = 33.7°
Answered by Tammy
Simple case of the sine law.
After you make you sketch , you should see that

sin F/7 = sin 72°/12
sin F = .5547...
angle F = appr 33.7°