Question

It is angle measure please help

Answer 1

Opposite angles are equal

$\\ \rm\longmapsto m+357=4m+6$

$\\ \rm\longmapsto 357-6=4m-m$

$\\ \rm\longmapsto 3m=351$

$\\ \rm\longmapsto m=\dfrac{351}{3}$

$\\ \rm\longmapsto m=117$