Look at part 1. How do you use a protractor to sketch a given angle?
Draw a horizontal line. Line up 1 endpoint with the midpoint of the protractor. Then mark a dot next to the given angle measure on the protractor. Draw a line connecting the endpoint to the dot.
What is the sum of angle ABC and angle CBD? Explain your answer.
The sum is 180°. They form a straight line, which means that they are supplementary angles. Supplementary angles have a sum of 180°.
Look at part 2. What is the missing angle measure? How do you know?
The missing angle measure is 28°. It is a complementary angle. So, the sum of all of the angles equals 90°:
Look at part 3. What are the attributes of a rectangle?
Opposite sides are equal in length and are parallel. Each angle is equal to 90°.
What are the attributes of a parallelogram?
Opposite sides are parallel and equal in length.
Is a rectangle a parallelogram? How do you know?
Yes. It has opposite sides that are parallel and equal in length.
Can a parallelogram also be considered a rectangle? Why or why not?
No. A rectangle has four 90° angles.
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