Owner's manual

44 — ITI SHEET METAL/HVAC PRO

Trig Examples (Cont’d)

Example 3 — Tan A:

Find the length of the transition for a 20° angle:

Side a = 18 Inches

Side b = unknown

a) Longhand Method: Use Tan = Opposite/Adjacent

KEYSTROKE DISPLAY

1. First solve for Tan 20° to find ratio, then enter in Memory:

oo 0.

20tμ M+ 0.36397

2. Solve for Side b by dividing Side a by stored ratio:

18÷®μ= 49.45459

(49.5 inches)

3. Clear Memory and clear display:

®®o 0.

b) Use Pythagorean Theorem Keys:

KEYSTROKE DISPLAY

oo 0.

18r Y 18.

20p /

Ø 20.°

R X 49.45459

(49.5 inches)