GeoGebra Classroom

# Construct a Rotation

Construct the rotation of ∆ABC about point P, by ∠ RST Using angle measurement, create angle with given size, and create polygon. You will be able to walk through the construction of a rotation. By the end of this exercise you should be able to explain how to complete the construction with paper, a pencil, and a compass.
Using the following steps, construct the rotation of ∆ABC about point P, by ∠ RST 1. Using the Angle Measurement tool (shown below) find the measure of ∠ RST: _____ * Choose vertices clockwise R → S → T 2. Select Create Angle with Given Size from the Drop-Down Menu. (shown below) Select Point A, select the Center of Rotation (point P), and input the angle of rotation (from in question 1) What is the name of the new point created? _______ 3. Select Create Angle with Given Size from the Drop-Down Menu. Select Point B, select the Center of Rotation, and input the angle of rotation What is the name of the new point created? _______ 4. Select Create Angle with Given Size from the Drop-Down Menu. Select point C, select the Center of Rotation, and input the angle of rotation What is the name of the new point created? _______ 5. Using the Polygon tool, connect points A’, B’, C’. (And back to A’) Write steps to construct the rotation of ∆ABC about point P, by ∠ RST on paper using a compass.