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Pi and Trigonometry Guide for TI-34

How to use Pi for circle geometry and calculate sine, cosine, tangent values in degree or radian modes.

1. Circle Area Calculations using Pi (π)

Use the dedicated π key for precise circle calculations.

Problem: Find the area of a circle with radius r = 5 (Area = π × 5²)

  • Step 1: Press π
  • Step 2: Press ×
  • Step 3: Press 5
  • Step 4: Press xⁿ 2
  • Step 5: Press enter

Result Output: 78.539816

2. Trigonometric Sine (sin) in DEG Mode

Problem: Calculate sin(30°)

  • Step 1: Ensure top status bar shows DEG (Press mode if needed)
  • Step 2: Press sin
  • Step 3: Press 3 0
  • Step 4: Press )
  • Step 5: Press enter

Result Output: 0.5