In Part 1, what type of angle is Angle A? How do you know?
An acute angle; its measure is less than 90º.
What type of angle is Angle B? How do you know?
A right angle; it is marked with a square, which indicates that it's a right (90º) angle.
Which angle has a greater measure, Angle C or Angle D? How do you know?
Angle D; it is a straight angle, so its measure is 180º. Angle C is obtuse, which means that its measure is between 90º and 180º.
Fill in the blank for Part 2:
How can you rewrite the addition sentence with the actual measures of
20º. Possible explanation: The sum of
In Part 3, how can you simplify the left side of the equation?
Combine like terms.
What terms can you combine?
What does the equation look like after you combine like terms?
What do you need to do in order to isolate
Subtract 18 from both sides, and divide both sides by 7.
What is the solution to the equation?
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