Texas Instruments TI-82 User Manual - Page 119
Drawing Circles
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Drawing Circles While a graph is displayed, Circle( lets you define a circle on the graph using the cursor. If a graph is not displayed, the instruction is copied to the Home screen. Directly on a Graph 1. When a graph is displayed, select Circle( from the DRAW DRAW menu (item 9). 2. Position the cursor at the center of the circle you want to draw. Press Í. 3. Move the cursor to a point on the circumference. Press Í. The circle is drawn on the graph. To continue to draw circles, repeat steps 2 and 3. To cancel Circle( press '. Because this circle is drawn on the display and is independent of the WINDOW values (unlike the Circle( instruction, see below), it appears as a circle. From the Home Screen or a Program Circle( (DRAW DRAW item 9) draws a circle with center (X,Y) and radius (these values can be expressions). Circle(X,Y,radius) Note: When the Circle( instruction is used from a program, the drawn circle may not look like a circle because it is drawn with respect to the current WINDOW values. For example, in the standard viewing WINDOW, Circle(0,0,7) displays: DRAW Operations 8-9
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