Angle Sums
Slope
Horizontal and Vertical
Parallel and Perpendicular
Equations of lines
100
The sum of angles in a triangle is
180
100
The slope of a line through the points (1,2) and (2,3) is
1
100
The slope of a horizontal line is
0
100
The slopes of two parallel lines are
equal
100
The slope-point form of the equation of a line is
y=mx+b
200
The exterior angle of a triangle is equal to
the sum of the two non-adjacent angles.
200
The slope of a line through (1,2) and (2,1) is
-1
200
The slope of a vertical line is
undefined
200
The product of the slope of two perpendicular lines is
-1
200
In the equation y=mx+b, m is the
slope
300
The acute angles of a right triangle are
Complementary
300
The slope of the line y=3x+1 is
3
300
The equation y=b is the equation of a (horizontal or vertical) line
horizontal
300
If the slope of a line is 2 then the slope of a line parallel to it will be
2
300
In the equation y=mx+b, b is the
y-intercept
400
If a triangle has an angle of 30 and an angle of 60 then it is a
Right Triangle.
400
Equation of a line with slope 2 and y intercept of 3 is
y=2x+3
400
The equation x=a is a
vertical line
400
The slope of a line perpendicular to a line with the slope of 2 is
-1/2
400
The slope-point form of the equation of a line with the slope of 2 through the point (1,3) is
y-3=2(x-1)
500
The measure of the acute angles of an isosceles right triangle is
45 degrees.
500
The slope of a line that passes through (-1,3) and (3, -2) is
-5/4
500
The equation of a vertical line through (-2,3) is
x=-2
500
The slopes of a perpendicular to a given line is
negative reciprocal of the slope of the line.
500
The equation of a line through (-1,2) with the slope of 3 is
y-2=3(x+1)
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