Answer:
Part 1) The measure of angle F is [tex]73\°[/tex]
Part 2)The value of x is [tex]17\°[/tex]
Step-by-step explanation:
Part 1) Find the measure of angle F
we know that
[tex]<F+107\°=180\°[/tex] -----> by supplementary angles
[tex]<F=180\°-107\°=73\°[/tex]
Part 2) we know that
The sum of the internal angles of a triangle must be equal to 180 degrees
so
In this problem
[tex]<D+<E+<F=180\°[/tex]
substitute values and solve for x
[tex]51\°+(3x+5)\°+73\°=180\°[/tex]
[tex]3x=180\°-129\°[/tex]
[tex]3x=51\°[/tex]
[tex]x=17\°[/tex]