What is the measure of angle 1 in the picture below?



90 degrees

135 degrees

45 degrees

225 degrees


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Here are 5 related questions to expand your understanding:
1. How do you calculate the measure of an unknown angle when two lines intersect?
2. What is the sum of angles in a triangle, and how can this help in determining angle measures?
3. How do supplementary angles relate to the calculation of angle measures?
4. What is the relationship between complementary angles?
5. How can you find the measure of an exterior angle in a polygon?

**Tip:** When two lines intersect, the opposite (or vertical) angles are always equal.

Explore how to calculate angle 1 using the Vertical Angles Theorem in geometry. This problem involves understanding the relationship between vertical angles and how they contribute to angle measures. Suitable for Grades 7-9 students looking to deepen their understanding of geometric angles.

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