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Geometry* Terms

Altitudes, circumcenter, perp. bisectors, etc

TermDefinition
altitiude thru the vertex, perp. to the base it passes through
concurrent when many lines meet at one point
perp. bisector bisects the base it goes thru & right angle
angle bisector bisects the angle it goes through
perp. bisector theorum if a point is on the perp. bisector of a segment, then it is at = distance from the endpoints of the segment
angle bisector theorum if a point is on the bisector of an angle, then it is at an = distance from the 2 sides of an angle
circumcenter made by perp. bisectors; equidistant to all 3 verticies
incenter made by angle bisectors; inscribed circle; equidistant to all 3 sides; always INSIDE a triangle
median thru the vertex, base bisector (NOT ALWAYS PERP.); Not always congruent
centroid made by medians, midpoint to centriod is 1/3 of the length of the median; divides all 3 medians into a 2:1 ration
orthocenter made by altitudes
triangle inequality theorum the 2 smallest sides added > third side
diagonal line from 1 verticie to another (triangles have none)
both sets of opposite sides parallel parallelogram, rectangle, square, rhombus
both sets of opp sides congruent parallelogram, rectangle, square, rhombus
both sets of opp angles conguent parallelogram, rectangle, square, rhombus
all sides equal rhombus, square
all angles equal rectangle, square
congruent diags rectangle, square, iso. trap
perpendicular diags rhombus, square, kite
diags bisect eachother parallelogram, rectangle, rhombus, square, iso. trap
Created by: dinosaurBlitz_
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