# Trigonometry

| October/November 2001

Perhaps some of my fellow shade-tree machinists would have a use for my easy way to figure the three most common angles.

First you need a scientific calculator, such as a Texas Instruments TI-30, which costs approximately \$11. Then you substitute your known numbers and angles for the ones in the three problems (see examples). Keep in mind that with angles, the numbers represent degrees, minutes and seconds, in that order.

To Find A

Use the numbers to the left of the decimals point for your angle.
8. 49           (Degrees)
29.4            (Minutes)
24.0            (Seconds)

Use the numbers to the right of the decimal point to figure the problem.
8.49
29.4
24.0

To Find A
Punch 0.224
Punch
Punch 1.500
Punch = 0.149
Punch INV
Punch TAN = 8.49
Punch 0.49
Punch x
Punch 60
Punch = 29.4
Punch 0.4
Punch x
Punch 60
Punch = 24
A = 8°, 29°, 24'

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