Hassan lined up the interior angles of the triangle along the line below. What is the measure of the missing angle along the line?

What is the value of x?

The measure of one interior angle of a triangle is 45°. What can you conclude about the other two interior angles of the triangle?
The measure of angle B is , and the measure of angle C is .What is the measure of angle D in degrees?

Lines and are parallel. Which angles represent alternate interior angles?

Which has a measure that is equal to the sum of the measures of the interior angles of a triangle?
Which set of angle measures could be the measures of the interior angles of a triangle?
What is the value of x?

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