Use a straightedge. Draw a line. Draw an acute angle with vertex A along the line. Then use a compass to copy the angle. Place the compass point at another point B along the line and draw the copied angle so
that the angle faces the original angle. Label the intersection of the angle sides as point C. Select the
triangle you have formed. What is true about the two base angles of AABC? What do you know about
CA and CB? What kind of triangle did you form? Complete the explanation.