Texas Instruments TINSPIRE Teacher Software Guidebook - Page 525

Identifying equations for circles and lines You can display the equation of any Analytic object (constructed in the Graphing View, or within the Analytic Window of the Plane Geometry View) and label it on the screen. 1. From the Actions menu, select Coordinates and Equations. 2. Click the circle or line to select it. The equation for the circle or line displays and the object blinks on the screen. 3. Press · to anchor the equation on the screen. Note: If you approach a defined point on the line or the center point of a circle, the coordinates for that point display instead of the equation. Move the pointer away from the defined point to obtain the equation of the object. Measuring objects You can obtain various measurements from the objects you draw. These measurements include finding areas, lengths, angles, and slopes. Measurement values are dynamic. If you measure sides and angles of a triangle, for example, and then alter the triangle, the measurement values update automatically. To change the displayed precision of an area, length, angle, or slope measurement, point to it and then press + or -. Measuring length You can use the Length tool to measure the length of a segment, circle arc, or vector. The length tool can also measure the side or perimeter of a polygon, the circumference of a circle, the distance between two points, the distance from a point to a line, ray, segment, or vector, and the distance from a point to a circle. Graphs & Geometry 513