User Manual

5-34

u To calculate the focus and length of latus rectum [G-SLV]-[FOCS]/[LEN]

Example To determine the focus and length of latus rectum for the parabola X =

(Y – 2)

+ 3

Use the following V-Window settings.

Xmin = –1, Xmax = 10, Xscale = 1

Ymin = –5, Ymax = 5, Yscale = 1

m CONICS

bwcwdw6(DRAW)

!5(G-SLV)

1(FOCS)

(Calculates the focus.)

!5(G-SLV)

5(LEN)

(Calculates the length of latus rectum.)

• When calculating two foci for an ellipse or hyperbolic graph, press e to calculate the

second focus. Pressing d returns to the first focus.

• When calculating two vertexes for a hyperbolic graph, press e to calculate the second

vertex. Pressing d returns to the first vertex.

• Pressing e when calculating the vertices of an ellipse will calculate the next value.

Pressing d will scroll back through previous values. An ellipse has four vertices.

u To calculate the center [G-SLV]-[CNTR]

Example To determine the center for the circle

(X + 2)

+ (Y + 1)

= 2

m CONICS

ccccw

-cw-bwcw6(DRAW)

!5(G-SLV)

1(CNTR)

(Calculates the center.)