Point, Line, Plane
Can planes be parallel?
yes (example, floor and ceiling)
How many degrees is an acute angle?
Between 0 and 90
points are on the same plane
sometimes
exactly 90 degrees
right
A location marked by a dot
point
Lines that are not on the same plane and don't intersect are ________.
skew
How many degrees is a right angle?
90
When planes intersect, it forms a line.
always
178 degrees
obtuse
two rays with the same endpoint
angle
Can two planes be skew?
No, planes are either parallel or intersecting
How many degrees is an obtuse angle?
between 90 and 180
Parallel lines intersect.
never
1 degree
acute
on the same line
collinear
Two lines intersect at a _____________.
point
A straight angle looks like what?
a line
Angles are two rays with a common endpoint.
Always
180 degrees
straight
on the same plane
coplanar
Two planes intersect at a __________.
line
Is it possible to have an angle that is more than 180 degrees?
Yes. (It's called a reflex angle and it's between 180 and 360 degrees)
Two lines are coplanar.
sometimes
more than 180 degrees
reflex
two lines that intersect to form right angles
perpendicular