Sharp EL-9900 User Manual

Polar coordinates are a different method of specifying a point in two dimensions; the

location of the point is described by the distance from the X-Y intersect “r”, and its

elevation angle “

θ”.

• Draw a graph: r = 16cos(

θ)sin(θ).

1. Press 

@ ;.

The SETUP menu appears.

2. Press 

E to select E

COORD, then press 

3

to select 3 Polar. Be sure

that the other settings are as

shown on the right.

To exit the SETUP menu,

press 

C.

3. Press 

Y.

The Graph Equation Entry window will appear.

4. At the first entry row R1=,

enter 16cos(

θ) 

×

θ).

Press 

E.

5. Press 

G to draw the

graph.

Press 

Z, then press

6 to select 6 Square.

θ