geometry unit 2
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20 Terms
what is a plane
infinenty thin flat surface that continues in every direction and is made up of infinite number of lines
how many lines passes through 2 points?
1 line
how many planes go through 3 points?
only 1 plane if non collinear
how much does the hour hand move each minute?
0.5
how much does the minute hand move each min?
6
how much does the hour hand move each section
30
what is a reflex angle
greater than 180
the angle of incidence is …
congruent to the angle of reflection
when 2 mirrors form a right angle any reflected ray comes back …
parellel
is traveling east on a sphere consider straight?
no unless its at equator
what is a great circle
largest possible circle that can be drawn on a sphere
are there parallel lines in spherical geo?
no
are there parallel lines in euclidan geo ?
yes
what is the sum of triangles in spherical geo
>180
what is the sum of triangles in euclidian geo
=180
how much great circles can go through 2 points?
infinite if opposites otherwise 1 only
where do great circles intersect on a sphere
north and south pole
what never intersects and is coplanar
parallel lines
what intersects and is coplanar
intersecting lines
waht never intersects and is noncoplanar
skew lines