Question 562704
Hi, I'll answer this assuming that the radius is 1.
when we measure in radians, we see that
{{{(angle/(2*pi))*circumference=arc length}}}
{{{circumference=2*pi*radius}}}
So,
{{{angle*radius=arc length}}}
So we have,
{{{(12x+7)*1=10x-7}}}
{{{2x=-14}}}
{{{x=-7}}}