rotate degrees Flashcards
R-270, R90 a, b = ,
-b, a
R-180, R180 a, b = ,
-a, -b
R-90, R270 a, b = ,
b, -a
y=-x
flip and negate
y=x
flip
reflect over x=_
(keep y value, see how far away something is from the x value, then use that number and add/subtract to find out new coordinates)
reflect over y=
(keep x value, see how far away something is from the y value, then use that number and add/subtract to find out new coordinates)
isometry
transformation that preserves both angle measure and segment length
scale factor that produces congruent figures
1 or -1
△ABC has been dilated with scale factor of 4. What is the measure of ∠B’ if ∠B=65 degrees
65 degrees (doesn’t change)
how to find scale factor
image/pre-image
what is sum of exterior angles of a polygon with 15 sides?
360 (always 360)
sum of interior angles
(n-2)180
one interior angle of regular polygon
(n-2)180 / n
reflection in origin
(-x,-y) (same as R180)
common order regarding vstch/sh, reflex, translations
reflex, vsh/vtsch, and then translations
√-x
reflected over y
-√x
reflected over x
f(-x)
reflected over y
-f(x)
reflected over x
line of reflection is perp to segment connecting a pre image point to its image
true
the line of reflection bisects the segment connecting pre image point to its image
true
the line of reflection intersects the segment connecting a pre-image point and its image as its midpoint
true
vst/vsh only affects
only y
