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 eighth set, students use the mathematical constant pi to determine how quickly the Ingenuity helicopter's blades must rotate in order for it to fly. Materials Pi in the Sky 8: Whirling Wonder worksheet – download PDF Pi in the Sky 8: Whirling Wonder answer key – download PDF (als