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 measure of the colored angle in part 1?
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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