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Geometry Ch 1 Fitch FMS

Terms in this set (51)

1-1 Net
A 2-dimensional diagram that folds into a 3-dimensional figure.
1-1 Isometric Drawing
Shows a corner view of a 3-dimensional figure; uses slanted lines to show depth; "equal measure"
1-1 Orthographic Drawing
3 separate views (top, front, & right); "straight drawing"
1-2 Point
Indicates a location; has no size.
1-2 Space
A boundless set of all points in 3 dimensions.
1-2 Line
Straight path in 2 opposite directions; no end; no thickness; contains infinitely many points; 1 dimension.
1-2 Collinear Points
Points that lie on the same line.
1-2 Postulate or Axiom
An accepted statement of fact; does not require further proof.
1-2 Through any 2 points there is exactly ___ ____.
one line
1-2 Intersection
The set of points which 2 figures have in common.
1-2 2 lines intersect in exactly ___ _____.
one point
1-2 Segment or Line Segment
A part of a line with 2 endpoints and all points between.
1-2 Ray
A part of a line with 1 endpoint and all the points on one side; extends forever in 1 direction.
1-2 Opposite Rays
2 rays that share the same endpoint and form a line.
1-2 Plane
Flat surface that extends without end; no thickness; contains infinitely many lines; 2 dimensions.
1-2 Coplanar Points
Points or lines that lie in the same plane.
1-2 The smallest number of points to define a plane is _______.
3
1-2 Through any __ noncollinear points there is exactly 1 plane.
3
1-2 Three points are ____________ coplanar.
always
1-2 Four points are ____________ coplanar.
sometimes
1-2 2 planes intersect in exactly ___ ____.
one line
1-2 A line and a plane intersect in exactly ___ _______.
one point
1-3 Coordinate
The real number that corresponds to a point.
1-3 Distance
The absolute value of the difference of coordinates. Always a positive number.
1-3 Distance Formula (Number Line)
|a - b|
1-3 Segment Addition Postulate
If points A, B, and C are collinear, and B is between A and C, then AB + BC = AC
1-3 Congruent Segments
2 segments with the same length.
1-3 Midpoint
The point which divides a segment into 2 congruent segments.
1-3 Segment Bisector
A point, line, ray, or segment that intersects a segment at its midpoint.
1-4 Angle
Formed by 2 rays (sides) with the same endpoint (vertex).
1-4 Acute Angle
0 deg < x < 90 deg
1-4 Obtuse Angle
90 deg < x < 180 deg
1-4 Right Angle
x = 90 deg
1-4 Straight Angle
x = 180 deg
1-4 Congruent Angles
Angles with the same measure.
1-5 Adjacent Angles
2 coplanar angles with a common (shared) side, a common (shared) vertex, and no common interior points (no gaps or overlaps).
1-5 Vertical Angles
2 angles whose sides are opposite rays. Congruent.
1-5 Complementary Angles
2 angles whose measures have a sum of 90 degrees.
+5 Extra Credit Points Reward for finding these FlashCards (sshhh...don't tell!)
email "Quizlet Ch 1 Extra Credit" to jfitch@bedford.k12.va.us before the Ch 1 Vocab Test
1-5 Supplementary Angles
2 angles whose measures have a sum of 180 degrees.
1-5 Linear Pair
2 adjacent angles whose noncommon sides are opposite rays. Forms a straight angle. Supplementary.
1-5 Angle Bisector
A ray that divides an angle into 2 congruent angles.
8-1 Hypotenuse
The longest side of a right triangle. The side opposite (across from) the right angle.
8-1 Pythagorean Theorem
In a right triangle, the sum of the squares of measures of the legs equals the square of the measure of the hypotenuse. a^2 + b^2 = c^2
1-7 Distance Formula (Coordinate Plane)
Pythagorean Theorem: Square Root of (Base squared + Height squared)
(-3)^2
Positive 9
1-3 Midpoint Formula (Number Line)
Average or mean. (a + b)/2
1-7 Midpoint Formula (Coordinate Plane)
Average or mean. x-coordinate is (x1 + x2)/2 and y-coordinate is (y1 + y2)/2
1-8 Perimeter
The sum of the lengths of the sides of a polygon. 1-dimensional.
1-8 Circumference
The distance around a circle.
1-8 Area
The number of square units a polygon or circle encloses. 2-dimensional.
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