Chapter 1 Flashcards
Formula for distance between 2 points.
d= sq. root of (x2-x1)sq.+(y2-y1)sq.
How to find distance on a # line?
Count from # to #.
What is precision of measurement?
1/2 the smallest unit on the ruler
What type of lines share NO points?
parallel
What is a ray?
1/2 a segment and side of angles
Measurement of a right angle?
90degrees
Obtuse measurement?
more than 90, less than 180 degrees
acute angle measurement?
less than 90 degrees
List 4 ways to name angles.
angle sign: vertex, 2 pts w/ vertex in middle, # of angle
What is an angle bisector?
ray that divides angle into 2 congruent angles
define adjacent angles
in the same plane,share a vertex/side, NO common sides
define Vertical angles
2 non-adjecent angles formed from intersecting lines(like an X)
define linear pair.
adjacent angles w/ non common sides
What is a complementary angle?
2 angles who = 90 degrees
What is a supplementary angle?
2 angles that = 180 degrees
Formula for midpoint:
(x_1 + x_2 divided by 2, y_1 +y_2 divided by 2)
what is the pythagorean theorem?
a squared +b squared= c squared
Midpoint with other value formula:
Write down each pt and its coordinate. Include the unknown pt. Solve algebraically, find unknown coordinate.
midpoint on a # line
a+b over 2
How do you find midpoint on a graph? (with vertical and horizontal lines)
Count from the 2 endpoints down to the middle. Record the coordinates.
If the line is diagonal, how do you find the midpoint?
you are actually finding the average (mean) of the x-coordinates and the average (mean) of the y-coordinates.
