What are linear pairs of angles?
Pre-AP Geometry Semester 1 Final Exam Review

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Mathematics
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9th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Linear pairs of angles are two adjacent angles that form a straight line. They are supplementary, meaning their measures add up to 180 degrees.
2.
FLASHCARD QUESTION
Front
What is a parallelogram?
Back
A parallelogram is a four-sided figure (quadrilateral) with opposite sides that are parallel and equal in length. The opposite angles are also equal.
3.
FLASHCARD QUESTION
Front
How do you prove that a quadrilateral is a parallelogram?
Back
A quadrilateral is a parallelogram if: 1) Both pairs of opposite sides are equal, 2) Both pairs of opposite angles are equal, 3) The diagonals bisect each other, or 4) One pair of opposite sides is both parallel and equal.
4.
FLASHCARD QUESTION
Front
What is the equation of a circle with center (h, k) and radius r?
Back
The equation of a circle is given by: $$(x - h)^2 + (y - k)^2 = r^2$$.
5.
FLASHCARD QUESTION
Front
What are vertical angles?
Back
Vertical angles are the angles opposite each other when two lines intersect. They are always equal in measure.
6.
FLASHCARD QUESTION
Front
What are complementary angles?
Back
Complementary angles are two angles whose measures add up to 90 degrees.
7.
FLASHCARD QUESTION
Front
What are same side interior angles?
Back
Same side interior angles are pairs of angles on the same side of a transversal that intersects two parallel lines. They are supplementary.
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