Walking along the equator of a mysterious planet the distanc

Walking along the equator of a mysterious planet the distance travelled is 102km, the intercepted arc, and the central angle formed is .045 rad. Find the radius of the planet.

Solution

angle (@) = arc length (l) / radius (r)

arc length ,l= 102 km

@ = 0.45 radian

r = l /@

= 102 / 0.45

r = 2266.67 km