Related Clues:

• Right triangle figure
• Mathematical ratio
• __ qua non
• --- "qua non"
• Trigonometry wave
• Cosecant reciprocal
• One of four in a square
• Geometry measurement
• Angle function
• See 23 Across
• Trigonometry curve
• Camera view
• Acute subject?
• Reporter's slant
• 0, for 180 degrees