A- On the planet Romulus, when Eisn (the Romulan sun) is overhead at Navak, objects 2000 km south in the Ar'hael Desert cast a 45 shadow. Based on this information, what is the circumference of Romulus in km to two significant digits?

B- Eisn (the Romulan sun) appears about 2.0 times as large as Pirek (a Romulan moon) in the Romulan sky. It takes Pirek approximately 22.3 of its diameters to transit the shadow of Romulus during a lunar eclipse. Using these values, a radius of Romulus of 2,200,000 m, a ratio of Eisn-from-Romulus distance to Pirek-from-Romulus distance of 1,000, calculate the radius of Pirek to one significant digit in meters.