Midterm Review Flashcards
Intersecting lines
Lines which meet at one point
Isosceles Triangle
Triangle with two congruent sides or two congruent angles
Parts of an isosceles triangle?
Two legs across from congruent angles, then a vertex across from the base
Linear pair
Adjacent, supplementary angles
Median
Connects a triangle from midpoint of a side to angle bisector of an angle
Midpoint
Point which splits a line segment into two equal parts
The mid segment of a triangle…
Is always parallel to the base and half of the base’s length
Obtuse Triangle
Any triangle with a measure over 90 degrees
Opposite rays
Literally just lines which form angles
Orthocenter
Where the altitudes of a triangle meet
Parallel lines
Coplanar lines which may never intersect
Perpendicular bisector
A line which meets another line at its midpoint, at a 90 degree angle
Perpendicular lines
Lines which meet at a 90 degree angle
Point
A single place in existence
Line
The connection of at least two points
Plane
A platform upon which points and lines lay upon
Postulate
A statement which must be taken as true and cannot be proven
Ray
Line with a defined start point, but no end point
Remote interior angles
Any angle within a triangle
Right angle
Angle which measures exactly 90 degrees
Scalene triangle
A triangle of which each side is different
Segment
A section of a line
Segment bisector
A line which divides a segment into 2 equal parts
Skew lines
Noncoplanar lines which may never intersect
Straight angle
An 180 degree angle
Supplementary angle
Angles which add up to 180 degrees
Theorem
A statement which can be proven but generally is simply accepted as truth
Vertical angles
Congruent angles located across from each other diagonally
Acute angle
Angle less than 90 degrees
Adjacent angles
Angle placed right next to each other
Altitude of a triangle
Line which makes a triangle right
Angle bisector
Divides an angle into two equal parts
Centroid
Take the median of each angle (midpoint to angle across from it, 2/3s rule)
Circumcenter
Bisects lines
Collinear
Points that are all connected by one line; must need three points to be NON-collinear
Coplanar
Points or lines on the same plane. There must be at least four points to be NON Coplanar
Complementary angles
Angles which add up to 90 degrees
Format of a conditional statement?
If (HYPOTHESIS) then (CONCLUSION)
Format of the inverse of a conditional statement?
If not (HYPOTHESIS) then not (CONCLUSION)
Format of the converse of a conditional statement?
If (CONCLUSION) then (HYPOTHESIS)
Format of the contrapositive of a conditional statement?
If not (CONCLUSION) then not (HYPOTHESIS)
CPCTC
Corresponding Parts of a Congruent Triangle are Congruent
Exterior angle
Angle located on an extension of a select side of a triangle
Fractional distance
Find the distance that is a/b of the way from (x, y) to (x,y)
