The "Pi in the Sky" math challenge gives students a chance to take part in recent discoveries and upcoming celestial events, all while using math and pi just like NASA scientists and engineers. In this problem from the set , students use the mathematical constant pi to identify an scientifically intriguing type of crater on Mars. Materials Pi in the Sky 4: Crater Curiosity worksheet – download PDF Pi in the Sky 4 answer key (first problem) – download PDF Background Craters form when an object h