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20 Cards in this Set
- Front
- Back
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What is a median?
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A line dropped from the vertex of a triangle such that it bisects the side of the triangle
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What are adjacent angles?
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Two angles are adjacent if they share a vertex and a common side.
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What is a perimeter?
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Sum of the sides of a polygon
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What is a plane?
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An infinite surface such that a line joining any two points on it is contained entirely on the surface
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What is a circle?
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Geometric locus of points in a plane situated at a given distance from a given point in this plane
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What is a radius
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a segment joining the center of the circle to a point on the circle
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What is a disk?
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the interior region of a circle
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What is a sphere?
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The locus of points in space equidistant from a given point
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What is an arc?
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A portion of a circle is called an arc.
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What is a diameter?
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A segment which passes through the center of the circle and has endpoints lying on the circle
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What is an angle bisector?
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An angle bisector is a ray that divides an angle into two equal parts
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Theorem-Vertical angles
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Two vertical angles are congruent
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What are perpendicular lines?
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Two lines are perpendicular if among the four angles they form two adjacent angles that are equal to each other.- NOT 90 degrees!
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What is a right angle?
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A right angle is an angle whose sides are perpendicular. We can say 90 degrees, we defined that in class.
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THEOREM- In a given plane...
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Through a given point on a line, we can only draw one perpendicular to that line
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Straight angle
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Sides form a straight line is called a straight angle. Two right angles
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acute
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angle whos measure is less than a right angle
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obtuse
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angle who's measure is greater than a right angle
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THEOREM iN THE SAME CIRCLE...
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THE RATIO OF TWO CENTRAL ANGLES IS EQUAL TO THE RATIO OF THEIR SUBTENDED ARCS
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THEOREM- Reflection
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A plane figure is congruent to its reflection
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