Manual

User's Guide — 61

GRADE/SLOPE

Back-Fill on a Slope — Percent of Grade Known

You’ve built 55 linear feet of a 3 foot high retaining wall that is 3 feet

from the base of a 65% grade. You need to pour back-fill within 12

inches of the top of the wall (for a 2 foot depth). How many cubic yards

of fill should you have delivered?

Keystroke Display

1. Find volume for “A”:

[On/C] [On/C] 0.

55 [Feet] 55 FEET

[x] 3 [Feet] 3 FEET

[x] 2 [Feet] [=] [M+] 330. CU FEET

2. Find run/diagonal of “B”:

65 [%] [Pitch] PTCH 0.65

2 [Feet] [Rise] RISE 2 FEET 0 INCH

[Run]* RUN 3 FEET 0-15/16 INCH

[Diag]* DIAG 3 FEET 8-1/16 INCH

*The Trig Plus III will have a higher fractional accuracy when dis-

playing these values. If you desire to match the results as shown,

press [Conv] [1] to temporarily set fractional accuracy to one six-

teenth, or use the Preference Setting to permanently set the calcu-

lator to one sixteenth.

(Cont’d)