Part 1 Flashcards

1
Q

Parallel Lines

A

Two lines that do not intersect and are coplanar (on the same plane).

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2
Q

Alternate Interior Angles

A

If a transversal cuts across non-parallel lines, each Alternate Interior Angle is simply the alternate angle to the other.

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3
Q

Straight Angle

A

An angle measuring 180 degrees.

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4
Q

Right Angle

A

An angle measuring 90 degrees.

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5
Q

Vertical Angles

A

Angles that are opposite one another (and congruent) when two lines intersect.

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6
Q

Adjacent Angles

A

Two angles on a plane that share a common vertex and side but have no overlap.

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7
Q

Supplementary Angles

A

Two angles that have a sum of 180 degrees.

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8
Q

Complementary Angles

A

Two angles that have a sum of 90 degrees.

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9
Q

Ray

A

Part of a line consisting of an endpoint and all points on the line extend away from the endpoint.

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10
Q

Opposite Rays

A

Two rays that share a common end point and form a 180 degree angle.

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11
Q

Line Segment

A

Part of a line that consists of two endpoints and a line in-between.

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12
Q

Perpendicular Lines

A

Two lines that intersect at a 90 degree angle.

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13
Q

Perpendicular Bisector

A

A line that intersects a segment at its midpoint creating 90 degree angles and two equal halves of the segment.

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14
Q

Segment Bisector

A

A line, ray or segment which cuts another line segment into 2 equal halves.

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15
Q

Angle Bisector

A

A line or ray that cuts an angle in half, forming two congruent angles.

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16
Q

Isosceles Triangle

A

A triangle with two congruent sides.

17
Q

Equilateral Triangle

A

A triangle in which all sides are congruent.

18
Q

Scalene Triangle

A

A triangle in which no two sides are congruent.

19
Q

Right Triangle

A

A triangle which has a 90 degree interior angle.

20
Q

Hypotenuse (Right Triangle)

A

The side of a right triangle opposite the right angle- the hypotenuse will also always be the longest side.

21
Q

Legs of a triangle

A

In a right triangle, the two sides opposite an acute angle. In an isosceles triangle, the two sides that are congruent.

22
Q

Altitude of a Triangle

A

The distance between the vertex of the triangle and the opposite side (The “y” axis difference between the top and bottom of the triangle).

23
Q

Median of a Triangle

A

A line segment drawn from one vertex to the midpoint of the opposite side (in an equilateral triangle, from the vertex to the middle of the opposite side).

24
Q

Midpoint

A

The point halfway between two given points.

25
Q

Linear Pair

A

A pair of adjacent angles formed by intersecting lines (can be viewed as supplementary angles)

26
Q

Point

A

Precise location on a plane. A point has no size.

27
Q

Line

A

Geometric figure (usually containing 2 points) that goes off in 2 directions endlessly.

28
Q

Plane

A

A flat, 2D surface extending in all directions.

29
Q

Coplanar

A

Referring to points that lie on the same plane.

30
Q

Collinear

A

Referring to points that lie on the same line.

31
Q

Skew

A

Lines in 3D space that do not intersect and are not parallel.

32
Q

Angle

A

Figure consisting of 2 different rays with the same endpoint.

33
Q

Circle

A

The set of all points in a plane that are a fixed distance from a given point- The center of the circle.