Find the missing side length of the triangle.
1 km
2.4 km

you can't solve x because it is 2 linear equation and you only have one equation

- (2, -7)

- lines r and s and lines t and u must be parallel

arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees