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Finally, he lifted the protractor and used a ruler to draw a ray from the vertex to the 50° mark. He named a point on this line B.
Frank then used his protractor to check his drawing. He found the measurement ∠BCD was 50°.
Frank also drew the 50° angle below following the same steps. This time he placed the vertex on the right side of his first line. His angle looked like this:
Next, Frank decided to draw an obtuse angle measuring 120°. He followed the same steps he used to draw the acute angle. After drawing the first side of the angle, he started at 0° and read the degree marks until he reached 120°. He placed a dot at 120°.
