Questions and Answers
Are vertical angles congruent?
Are definitions reversible?
Are theorems reversible?
Are opposite rays collinear rays with a common endpoint and extend in the same direction?
Signup and view all the answers
Are supplementary angles congruent?
Signup and view all the answers
If two angles are complementary, are they each acute?
Signup and view all the answers
Is the supplement of an acute angle acute?
Signup and view all the answers
Are the bisectors of vertical angles opposite rays?
Signup and view all the answers
Are vertical angles complementary?
Signup and view all the answers
Does an obtuse triangle have three obtuse angles?
Signup and view all the answers
Is a right triangle isosceles?
Signup and view all the answers
Is the base of an isosceles triangle shorter than either leg?
Signup and view all the answers
Does a median of a triangle bisect the side to which it is drawn?
Signup and view all the answers
If a median of a triangle is also an altitude, is it also an angle bisector?
Signup and view all the answers
Does a triangle have three sides?
Signup and view all the answers
Is any angle congruent to itself?
Signup and view all the answers
If all pairs of corresponding angles of two triangles are congruent, are the two triangles congruent?
Signup and view all the answers
Does a median form a right angle with the opposite side of the triangle?
Signup and view all the answers
Does one point determine a line?
Signup and view all the answers
If ∆SCA is scalene, is SC ≅ CA?
Signup and view all the answers
Is a right triangle equilateral?
Signup and view all the answers
If two angles are both complementary and congruent, are they right angles?
Signup and view all the answers
Is a line segment the shortest path between two points?
Signup and view all the answers
If two points are each equidistant from the endpoints of a segment, do they determine the perpendicular bisector of that segment?
Signup and view all the answers
Are two lines that do not intersect parallel?
Signup and view all the answers
Do alternate interior angles have a common vertex?
Signup and view all the answers
Are the slopes of perpendicular lines opposites?
Signup and view all the answers
If the base of an isosceles triangle is on the x-axis, are the slopes of its legs opposites of each other?
Signup and view all the answers
Are alternate exterior angles acute?
Signup and view all the answers
Is a kite a parallelogram?
Signup and view all the answers
Does a convex polygon have at least one interior angle greater than 180°?
Signup and view all the answers
Is a rectangle a square?
Signup and view all the answers
If a parallelogram is equiangular, is it a rectangle?
Signup and view all the answers
If a parallelogram is equilateral, is it a rhombus?
Signup and view all the answers
Does a quadrilateral have five sides?
Signup and view all the answers
Are the diagonals of a trapezoid congruent?
Signup and view all the answers
Does a polygon have the same number of sides as vertices?
Signup and view all the answers
If two lines are cut by a transversal, are the alternate interior angles congruent?
Signup and view all the answers
Can only one side of a parallelogram have a slope of three?
Signup and view all the answers
Study Notes
Vertical Angles and Definitions
- Vertical angles are always congruent, meaning that they are equal in measure.
- Definitions are always reversible, allowing for flexibility in understanding concepts.
Theorems and Rays
- Theorems are sometimes reversible, depending on the specific theorem.
- Opposite rays are never collinear rays that extend in the same direction; they diverge from their common endpoint.
Angles and Triangles
- Supplementary angles are sometimes congruent, such as in special cases.
- If two angles are complementary, they are always acute, meaning they measure less than 90 degrees.
- The supplement of an acute angle is never acute; it is always obtuse or equal to 90 degrees.
Additional Properties of Angles
- The bisectors of vertical angles are always opposite rays, forming straight angles.
- Vertical angles can sometimes be complementary, depending on their measures.
Triangle Characteristics
- An obtuse triangle never has three obtuse angles; it can only have one obtuse angle.
- A right triangle is sometimes isosceles, but it's not a requirement.
- The base of an isosceles triangle is sometimes shorter than either leg, depending on its configuration.
Median and Triangle Properties
- A median of a triangle always bisects the side to which it is drawn, creating two equal segments.
- If a median of a triangle is also an altitude, it is always an angle bisector, ensuring balanced triangles.
Basic Triangle Facts
- A triangle always has three sides, a fundamental characteristic of its definition.
- Any angle is always congruent to itself, highlighting the reflexive property of equality.
Congruence and Angles
- If all pairs of corresponding angles of two triangles are congruent, then the triangles are sometimes congruent under specific conditions.
- A median sometimes forms a right angle with the opposite side of the triangle, depending on the triangle's type.
Points, Lines, and Segments
- One point never determines a line; at least two points are needed for a line to exist.
- A line segment is always the shortest path between two points, adhering to geometric principles.
Perpendicular Bisectors and Parallel Lines
- If two points are equidistant from the endpoints of a segment, those points always determine the perpendicular bisector of the segment.
- Two lines that do not intersect are sometimes parallel; they can be skew lines in three-dimensional space.
Angles and Slopes
- Alternate interior angles never share a common vertex, as they lie on opposite sides of a transversal.
- The slopes of perpendicular lines are sometimes opposites, indicating a right angle between them.
Properties of Isosceles Triangles
- If the base of an isosceles triangle is positioned on the x-axis, the slopes of its legs are always opposite of each other.
- Alternate exterior angles are sometimes acute, varying with the specific angles involved.
Polygon and Quadrilateral Properties
- A kite is sometimes a parallelogram, depending on its specific properties.
- A convex polygon never has an interior angle greater than 180 degrees, defining its convexity.
- A rectangle is sometimes a square, only when all sides are of equal length.
Parallelograms and Equiangular Properties
- If a parallelogram is equiangular, it is always a rectangle, ensuring right angles at all corners.
- If a parallelogram is equilateral, it is always a rhombus, as all sides are equal in length.
Quadrilateral and Polygon Definitions
- A quadrilateral never has five sides; it is defined specifically as having four sides.
- The diagonals of a trapezoid are sometimes congruent, depending on the nature of the trapezoid.
Polygon Characteristics
- A polygon always has the same number of sides as vertices, which is a fundamental characteristic of polygonal shapes.
- If two lines are cut by a transversal, alternate interior angles are sometimes congruent, based on their positions relative to the transversal.
Slope of Parallelograms
- Only one side of a parallelogram can never have a slope of three, as the slopes of opposite sides are equal in a parallelogram.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your understanding of geometric concepts with these flashcards. Each card presents a statement about geometric properties, asking whether it is always, sometimes, or never true. Perfect for students looking to reinforce their knowledge in geometry.
