Supplementary 5 — Use of lines
5. Lines
The E L-51 0 0 provide s 5 lines in the A E R M ode on w hic h fo rm ula s can be sto red. By placing equ atio ns on each line, com 
bined w ith Safe G uard, yo u can develop a "H a n d b o o k o f fo rm u la s " fo r later use. Y ou m ay use the lines as a num ber of
o p tio n a l means o f solving fo r a variable in line 1.
M ode = A E R (2 nd F) [ CA l
on Lin e 1 key in: f (A B ) = [V ~ | ( A 2 | + | B 2 ) (P ythagorean The orem )
The line fo llo w in g the last e n try indicates th e p o s itio n o f the n e x t e n try. T his lin e m ust be in the display before going to
the n e x t fo rm u la line. If th e cursor is flashing it m ust be m oved to the rig h t u n til it disappears. T o go to th e n ext fo rm u la
Line:
Key in: (2 nd F) ^ (end m ark w h ich appears above th e COM P key in the low e r rig h t o f the c a lc u lato r). Y o u r
display shou ld now read 2;
Key in : f (C D E ) = CD [ X l S IN E (A rea o f a Parallelogram )
Press (2 nd F) ^ to get 3;
Key in: f(F G H ) = .5F l X l (G l + l H) (A rea o f a T rapezoid)
Press (2nd F) to g et 4 ;
Key in: f (I) = 7rl2 , 47r12 (A rea o f a C ircle, S urface Area o f a Sphere)
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