Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
What is Geometry?
|
is the study of angles and triangles,perimeter,area and volume.
|
|
|
What is the meaning of the two greek words,geos and metron/metric/metrica?
|
Geos means earth while Metron/metric/metrica means measure.
|
|
|
what is a point?
|
It's a specific location in space but has NO DIMENSION.
example: dot,mole,period etc. |
|
|
What is a line?
|
A path described by a moving point, it HAS DIMENSION (length).
example: zipline,thread etc. <--------> AB read as line AB (a line has arrows on each side) |
|
|
What is a plane?
|
A flat surface,HAS DIMENSION (has length & width but has NO THICKNESS),can be named by at least 3 POINTS.
|
|
|
What is a line segment?
|
a part of a line that begins on one point & ends on another point.
_____ RA read as line segment RA |
|
|
What is a ray?
|
Part of a line that extends INDEFINITELY in one direction.
---------> AZ read as ray AZ (has only one arrow in one endpoint) |
|
|
What is a bisector?
|
A line that intersects the line segment at its midpoint.
|
|
|
Angle,Vertex,Degree
|
Angle- two rays with a common endpoint.
Vertex- a common endpoint. Degree- most common unit of measure for angle. |
|
|
Midpoint
|
Divides the line segment into two congruent segments.
|
|
|
Congruent,Collinear
|
Congruent- Exactly the same or equal measures.
Collinear- points that are in one line. |
|
|
Acute angles
|
Measures between 0° and 90°
|
|
|
Right angles
|
Measures equal to 90°
|
|
|
Obtuse angles
|
Measures between 90° and 180°
|
|
|
Perimeter
|
Rectangle= (2×L) + (2×W)
Square= S×4 Triangle= a+b+c |
|
|
Area
|
Rectangle= L×W
Square= S×S Triangle= (b×h)÷2 Parallelogram= b×h Trapezoid= (b1 + b2)×h÷2 |
|
|
Complementary Angles
|
90°
|
|
|
Supplementary Angles
|
180°
|
