ThreeDee for TI-83 series Help/Demo

Calculating 6.2 Example 19 with ThreeDee v1.1 for TI-83 series and TI-84 series, excl. TI-84 Plus C Silver Edition until further notice/updates.

Step 1: Let Y1 be the equation for the base of the cylinder
:Y1=√(16-X²

Step 2: Let Y2 be the equation for the area of a 30°-60°-90° triangle
A(x) = 1/2*b*h = x*[x*tan(30°)] = x²/√12
:Y2=X²/√(12

Step 3: Press [PRGM], then select the menu item "THREEDEE". If it isn't there, you need to get it from me, or someone with a link cable and a little calculator knowledge. Press [ENTER] again to run it, then quickly press a key when it says "INITIALIZING." to prevent a crash*.

Step 4: Press [ENTER] in the "> SET INTERVAL <" menu option to set the interval to [-4,4]. For "LO:", type in 4 and press [ENTER]. Repeat for "HI:", but use 4.

Step 5: You should end up at the main menu. Scroll down with [down arrow] to ">  6.2 PART 2  <" option and press [ENTER].

Step 6: After a few seconds, the result of 24.63361149 will appear on the screen. Press [ENTER] to return to the main menu, and [MODE] or [CLEAR] to return to the TI-OS home screen.

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*The program does automatic interval estimation for 6.2 part 1 problems. It will crash with "ERR:BAD GUESS" if Xmin or Xmax lie outside the domain of Y1 or Y2. It will also crash if Y1 or Y2 are undefined (read: blank)