Graphs & Geometry 515
Finding the circumference of a circle or the perimeter of a
polygon, rectangle or triangle
1. From the Measurement menu, select the Length tool.
2. Click the object to measure its circumference or perimeter.
3. Press · to anchor the measured value on the work area.
Measuring one side of a triangle, rectangle, or polygon:
1. From the Measurement menu, select the Length tool.
2. Point to the side that you want to measure.
Initially, the perimeter of the object displays, along with a visual
reminder that you can use e to measure the side instead.
3. Press
e to display the length of the side, and click to attach it to the
pointer.
4. Position the measurement, and click or press
· to anchor it on the
work area.
In this example, length is measured
from the center of the circle to the
upper left vertex of the polygon.
Measured circumference and perimeter
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